Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 833:
1896, reply letter card essay of 10k+10k blue, contains two unsevered letter cards, size of each 174x106mm, appropriately folded, VF and scarce, such essays were presented to participants of the UPU Conference of 1906 in Rome, SC #ES6, Est. $1,200-$1,500
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