Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1536:
VIENNA ISSUE: 1920, black-and-white imperforated 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, Bulat #V27-40, Est. $1,200- $1,500
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