Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1059:
1913, Tercentenary of the Romanov Dynasty, Catherine II, imperforated large die proof of 14k in black, printed on chalk-surfaced thick paper, size 38x47mm, VF and very rare, only limited quantity of 14k proofs were printed, proofs in black are extremely rare, Est. $1,500-$2,000 , Sc. #94
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