Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1408:
1918, black overprint (type 33) on perforated 20k-3.50r and imperforate 1r, all are properly cancelled, F/VF, valuable stamps properly expertized, 20k is not priced used and 25k is priced with ”-” in the Cat., others have C.v. $77, Bulat #1882/94
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