Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1096:
1884, 3.50r black and gray and 7r black and yellow, complete set of two on vertically laid paper, stamp of 3.50r with altered perforation at bottom (not mentioned in the certificate), large part of OG, fine centering, A. Farberov individual certificates, C.v. $2,000, Est. $750-$1,000, Sc. #39-40
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