Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1065:
1913, Tercentenary of the Romanov Dynasty, Paul I, imperforated large die proof of 35k in blue, printed on chalk-surfaced thick paper, size 44x60mm, no any defects, VF, proofs in blue are very rare, Est. $1,300-$1,600 , Sc. #98
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