Lookalike licence plate from the period of 2000-05. Still not completely phased out. The registration acronym HK (inventive suggestions: Hong Kong, Hanseatic Kiaochow) does not truly exist. The very reason why this letter combination was chosen. The technical inspection decal (expired) looks genuine although same claim that it is also a facsimile. The dexter (from car side) of the heraldic decal shows a spread eagle (riding the thermals). Sinister, three terrestrial trees. It will be the town decal of the registration office in the original. Unrelated: BW stands for Bundeswehr (no POVs, only utility and staff vehicles).
Most local junk cars will be licence plate stripped. In theory the only way they can be deregistered. (Does not hold for the decal free licence plates of small trailers.)