Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1066:
1913, Tercentenary of the Romanov Dynasty, Elizabeth Petrovna, imperforated large die proof of 50k in dark ultra, printed on chalk-surfaced thick paper, size 39x47mm, previously hinged, no thins or any hidden defects, VF, proofs of 50k are very rare, especially in ultramarine, Est. $1,500-$2,000, Sc. #99
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