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 Coro Jewelry Patents | Home > CORO DESIGN PATENTS > 
Coro Duette Patents
Each Coro Duette or separable brooch had a uniquely shaped Duette frame made specifically to hold the two pin clips (or fur clips)in a fixed position so that together they could be worn as a brooch. When the duette frame becomes separated from the clips it is almost impossible to know what pin clips it belongs with and the duette is lost to jewellery collectors. Single duette clips can often be found but the value of a separated clip is far lower and less desirable than a fully assembled duette.
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Candas Duette Mechanism

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105112 Coro Katz Bow 37
Patented by Coro as a Brooch

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110296 Coro Verrecchio Brooch Duette 38
"Quivering Camellia" Duette
p. 51 Brunialti, American Costume Jewelry


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110296
Robin Deutsch Collection

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Linn Alber Camelia Duette

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Coro Camellia Frame

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115266 Coro Katz Floral Brooch Duette 39
"Bell Flower" Duette
p. 68 Tribute to America, Brunialti


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LChampion Duette-5

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LChampion Duette-5b

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115852 Coro Katz Floral Brooch Duette 39
"Trembling Flowers" Duette
p. 68 Brunialti, Tribute to America


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116233 Coro Katz Floral Brooch 39
"Nodders Flower"
p. 68, Brunialti, Tribute to America


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116233 Duette
Courtesy Diane of Past & Present Jewelry

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116233 Duette
Courtesy Jan of EdgewaterVintage Jewels.com

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LChampion Duette-4

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LChampion Duette-4b

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116477 Coro Katz Pin Clip Duette 39

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116478 Coro Katz Pin Clip Duette 39
Quivering Camellia Duette - variation on design patent 110296.
p. 51, Brunialti, American Costume Jewelry


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116478
Enamel Variation - Courtesy Jan of EdgewaterVintage Jewels.com

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116478
Courtesy Merry Kaufman

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116607 Coro Katz Floral Pin Clip 39

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116607
Courtesy Beth Rowlands of Emerald City

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EmCity Duette 1

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122199 Coro Katz Rose Brooch Pin Duette 40

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122436 Coro Katz Rose Brooch Duette 40

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122438 Coro Katz Floral Brooch Duette 40

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122485 Coro Katz Floral Duette 40

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Jan Bunny Flower Lady Coro duette

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diane Past and Present Coro Floral 3

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122603 Coro Katz Pin Clip 40

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122604 Coro Katz Pin Clip 40

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123165 Coro Katz Floral Duette 40

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123165
Courtesy Adrienne Shivers

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123280 Coro Verrecchio Floral Brooch Duette 40
Quivering Camellias Duette - variation on design patent 110296

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125171 Coro Verrecchio Brooch 41

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125171
Luda Tovey Collection

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125171 Frame

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125171
Courtesy Beth of Emerald City

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126490 41 Coro Verrecchio Calopsitta Clip

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Coro Calopsitta Duette
Luda Tovey Collection

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Calopsitta Frame

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Enamel Variation

Courtesy Jan Gaughan
Eclectic Vintage


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127445 Coro Pauzat Seahorse Brooch 41

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127909 41 Coro Katz Birds SingingPair Brooch

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127909
Pat Seal Collection

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128823 41 Coro Katz Birds Brooch
Giant Pheasants duette. p. 72 Brunialti, Tribute to America

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129437 41 Coro Katz Bird 2Owls Brooch
Pictured on p. 175, Leshner, Costume Jewelry Identification and Price Guide

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129437
Duette
Robin Deutsch Collection


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130144 41 Coro Verrecchio Duette
"Lovebirds Duette", p. 73/74, Brunialti, Tribute to America

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130144
Kaye Jaye Collection

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1941 - No Patent
1941 "Big Birds" Duette without frame. Not patented. p. 73/74 Brunialti, Tribute to America

Luda Tovey Collection


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131524 Coro Katz Floral Duette 42

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131976 Coro Verrecchio Floral Duette 42

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131976
Luda Tovey Collection

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131976 Duette Frame

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133472 42 Coro Katz Bird Duette

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133472
Sparrow Duette beautifully restored.

Linn Alber Collection


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133477 Coro Katz Bee Duette 42

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133477
Courtesy Cordelia's Cache

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133479 42 Coro Katz Birds Duette

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133745 Coro Katz Bow Duette 42

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134981 43 Coro Katz Birds Duette

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134981 1943
Courtesy of Annete Forslund

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134981 1943
Courtesy of Annete Forslund

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134981
Courtesy Sherry of Glitter-Gals

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135970 Coro Katz Thoro Breds Duette 43

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135970
Courtesy Jennifer Lynn's Timeless Treasures

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135970 Clips and Earrings
Luda Tovey Collection

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138612 44 Coro Katz Bird 3Owls Duette

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138958 Coro Katz Frogs Duette 44

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138960 Coro Katz Hoots Owls Duette 44

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138960
Robin Deutsch Collection

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138960
Courtesy Brenda of vintagejewelry.com

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138961 44 Coro Katz HeavenlySwallows Duette

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138961
"Heavenly Swallows" pin, duette & earrings

Luda Tovey Collection


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Swallows Frame

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139096 Coro Katz Floral Duette 44

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139101 Coro Katz Dolphins Duette 44

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139102 Coro Katz Nautilus Shell Duette 44

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139102
CoroCraft Sterling 1/2 Duette

Luda Tovey Collection


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139405 Coro Katz Fish Duette 44

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139405
Courtesy Merry Kaufman

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139405 Clip (half duette)
Luda Tovey Collection

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139406 Coro Katz Floral Duette 44

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139406
Courtesy Beth Rowlands of Emerald City

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139691 Coro Katz Duette 44

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140014 44 Coro Katz "Bill and Coo" Duette

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140014 44
Courtesy incrediblejewelry.com

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140326 Coro Katz Fighting Cocks Duette 44

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140326
Cathy Gordon Collection

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141073 Coro Katz JB Turtles Duette 45

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141116 Coro Katz Birds Duette 45

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141120 Coro Katz Birds JB Duette 45

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141120
Kaye Jaye Collection

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141121 Coro Katz Bow Duette 45

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141180 Coro Katz Fighting Birds Brooch

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141346 Coro Katz Dancing Girls Duette 45

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142483 Coro Katz Rabbits Duette 45

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143223 Coro Katz Duette 45 1

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144195 coro Katz King Queen Duette 46

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144196 45 Coro Katz Bird Heads Duette

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143224 Coro Katz Bow Duette 45

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144197 Coro Katz Floral Duette 46

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146031 Coro Katz Fans Duette 46

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146032 Coro Katz Ladies Faces Duette 46

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146033 Coro Katz Deer Duette 46

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146034 Coro Katz Swirl Duette 46

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146035 Coro Katz floral duette 46

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146036 46 Coro Katz Peacock Duette

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146036
Courtesy Lisa Botsko of Jazzle Dazzle

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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146036
Ad "...inspired by old China..."

Courtesy IncredibleJewelry.com


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146037 Coro Katz Floral Swirl duette 46

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146038 Coro Katz Floral Duette 46

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146039 Coro katz Duette 46

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146048 Coro Katz Bow Duette 46

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146051 Coro Katz Floral Duette 46

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146141 Coro Katz Bird Duette 46
"Cocorito"

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147179 Coro katz Duette 46

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Duette - Shield
Similar but not identical

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Sheilds Frame

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147441 coro Katz Butterfly Duette 46

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147452 Coro Katz Brooch 47

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147661 Coro Katz Brooch 46

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147664 Coro Katz Brooch 47

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Linn Alber Coro Duette

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147665 Coro Katz Brooch 47

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147666 Coro Katz Brooch 47

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147667 Coro Katz Ribon Sheild Form Duette 47

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147669 Coro Katz Floral Duette 47

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148174 Coro Katz Duette 47

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148875 Coro Katz Floral Duette 48

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148876 Coro Katz Flower Duette 48

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148877 Coro Katz Flower Duette 48

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148998 Coro Katz Duette 47

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149069 Coro Katz Flies Duette 47

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149187 Coro Katz Turtles Duette Brooch 47

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149189 Coro katz Fish JB Duette 48

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149363 Coro Katz floral duette 48

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150593 Coro Katz Shell Brooch 48

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150616 Coro Katz Duette 48

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151137 Coro Katz Bow Duette 48

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151151 Coro Katz 2 Birds Duette 48

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151151 Coro Lovebirds Duette Ad

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151258 Coro Katz Comet Duette 48

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Coro Comets Duette
Luda Tovey Collection

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Comet Frame

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151259 Coro Katz Bow Duette 48

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151259 Coro Katz Duette 48
Robin Deutsch Collection

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151262 Coro Katz Duette 48

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151264 Coro Katz Duette 48

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151265 Coro Katz Bow Duette 48

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LChampion Duette-3

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LChampion Duette-3b

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151266 Coro Katz Bow Duette 48

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151364 Coro Katz Floral duette 48

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151364
Courtesy Linn Alber

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151364 Coro Apple Blossom Duette Ad

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151996 Coro Katz Duette 48

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151998 Coro-Katz Duette 48

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151999 Coro Katz Duette 48

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153068 Coro Katz Duette 48

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154396 Coro Katz Flower Brooch 49

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Linda Herberling coro duette

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No Patent - Coro The Victor Horse Ad_1948
Sold as a single pin the horse was called "Victor" - when sold as a duette it was called "Daily Double".

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No Patent - Duette and Earrings
"DAILY DOUBLE" duette originally sold for $4.50, matching earrings at $2.  Also sold as a pin with a single horse called "VICTOR".

Luda Tovey Collection


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Daily Double Frame

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155163 Coro Katz Bow Duette 49

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155891 Coro Katz Deorative Bow Duette 50

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158592 Coro Katz Floral Ribbon Duette 50

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159632 Coro Katz Decorative Ribbon Duette 50

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163200 Coro Katz LoveBirds Duette 51

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165290 Coro Katz Foliate Duette 51

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169002 Coro Katz Dancers Minuet Duette 53
Patent number supplied by Sherry Jones of Glitter Gals

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169679 Coro Katz Dancing Flower Girls Duette 53

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177260 Coro Katz Foliate Duette 56

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177380 Coro Katz Foliate Duette 56

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Coro Ad - 1948
6 different duettes featured
Courtesy Beth of Emerald City


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Rachel J Coro Duettes

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Coro Floral Duette.1

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Floral Vermeil Frame

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Jennifer Lynn Timeless Treasures Coro Duette

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Lee Coro Duette

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Adrienne Shivers Coro duette

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diane Past and Present Coro Floral 5

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Jeri Coro Floral duette
Courtesy of Jeri of Jeri's Joolz

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Coro duette bracelet demi czech style.1

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Unusual Frame

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Mystery Frame

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Sue Sinclair Mystery Duette Frame.1

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Sue Sinclair Mystery Duette Frame.2

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Mystery Duette Frame
Courtesy of Beth Rowlands of Emerald City

2¼ by 1¼”


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Suzi UK Floral Duette

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Suzi UK Floral Duette Frame

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LChampion Duette-2

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LChampion Duette-2b

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LChampion Duette-6

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LChampion Duette-6b

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LChampion Duette-7

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LChampion Duette-7b

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LChampion Duette-8b

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LChampion Duette-9

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LChampion Duette-9b

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LChampion Duette-10

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LChampion Duette-10b

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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Courtesy of Louise Champion

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Courtesy of Louise Champion

 
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