Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1610:
1918, Tsar Ferdinand, imperforate plate proofs of 1st-10st, complete set of four, blocks of four printed on thin chalk-surfaced paper, no gum as produced, NH, VF and rare, Est. $800-$1,000, Scott #130-33
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