Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1087:
1896, essay of letter card with pre-paid reply 10k+10k blue, each part with red overprint ”PROEKT”, insignificant perf separation at right, still fresh, VF and very rare, Standard Cat. #ES6 A, Est. $1,000-$1,200
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