Official not issued: 15 piastre on 3 Mark violet black, overprint in type II "A above with serif", vertical type pair - upper stamp in base stamp type I and lower stamp in base stamp type II, mint never hinged, very fine, unsigned, photo expertize Ronald F. Steuer BPP "in perfect quality. ", Michel 55.000.- - free of premium for the type pair, one of the largest rarities of all issues "German foreign countries post offices and colonies"