Bidspirit auction | Imperial Russia - Postal Stationery

Imperial Russia - Postal Stationery items - 1896, essay for Imperial reply letter card 10k+10k blue, contains two unsevered letter cards, size of each 174x106mm, appropriately folded, perfect condition, VF and scarce, such essays were presented to participants of the UPU Conference of 1906 in Rome, C.v. $2,000, Standard #ES6