Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2141:
1920, black-and-white imperforate photo proofs of 1hr-200hr, complete set of 14, very fresh and choice, no gum as issued, VF and very rare especially in complete set, each value expertized by Z. Mikulski, Est. $1,200-$1,500, Bulat #V27-40
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