Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 743:
1889-90, proof of pre-printed stamp for stationery envelope of 7k in blue, double impression on watermarked paper (similar to used for the issue), size 34x40mm, no gum as produced, VF and scarce, Standard Cat. #MK41, Est. $700-$800
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