Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3

Imperial Russia - Postal Stationery items

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Start price: $600

Buyer's premium:

1896, reply letter card essay of 10k+10k blue, contains two unsevered letter cards (reply portion closed), each part with red overprint ”PROEKT”, insignificant perf separation at right, still fresh, VF and very rare, Standard Cat. #ES6 A, Est. $1,200-$1,500