10 Rbl. on 1 Rouble definitive, overprint type III, used with altered mute postmark 15 5 42 and single-line "Alexanderstadt" handstamp, exceptionally good condition! One of the greatest rarities of the German occupation issues of World War II, signed Keiler, photo certificates Walter Zirath (1993) and Walter Zirath BPP (2025) "No faults are apparent. This is a very rare stamp of which only a few examples are known.", Mi. 32.000.-