Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2077:
1918, violet overprint (type 2b) on 4k red, perforated block of six, used on local registered cover in Gomel together with two other overprinted values, backstamped, VF, ex-Dr. Seichter, Bulat #297
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