Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1276:
1918, black overprint (type 2) on 50k lilac and green, perforated block of nine cancelled by Sorochyntsi (Poltava Gub.) ”9.3.19” date stamp, perforation reinforcement at right, fresh, VF and rare multiple, C.v. $675 as nine singles, Bulat #143
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