Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 747:
1918, Tsar Ferdinand, imperforated die proofs of 1st-10st, printed on thin chalk-surfaced paper, complete set of four, blocks of four, no gum as produced, NH, VF and rare, Est. $600-$800, Sc. # 130-33
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