10 Rbl. on 1 Ruble postage stamp, overprint in Type III, used with a silent, certified postmark 15 5 42 and a single-line postmark "Alexanderstadt", in exceptionally good condition! This stamp is one of the greatest rarities of the German occupation issues during World War II, signed Keiler, photo certificates Walter Zirath (1993) and Walter Zirath BPP (2025) "No defects are visible. This is a very rare stamp of which only a few specimens are known.", Michel 32. 000.-