Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Imperial Russia

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Start price: $750

Buyer's premium:

1858, 10k brown and blue, perforation 14½x15, printed on thin paper with numeral ”1” watermark, intact perforation and fresh colors, unused, no gum, VF and scarce, minor corners soiling not mentioned in N. Mandrovski certificate, C.v. $4,400 for stamp w/o gum, Est. $1,000-$1,500, Sc. #2