Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1194:
1918, black overprint (type 48) on perforate 3k-10r with additional inverted overprint on 3.50r, the total is 11 stamps, full/large part of OG, mostly VF, various experts hs on reverse, C.v. $388, Bulat #2060/73, 2071a
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