65c - $2.60 Graf Zeppelin, set of three on 2c Sesquicentennial Exhibition entire, tied by "Washington D.C. / Apr 19 / 5PM / 1930" duplex, dual United States and Germany flight cachets, with small circular "This Article Made the Complete Round Trip / Via Graf Zeppelin" handstamp, with Friedrichshafen (6.6.30) and New York (Jun 8) backstamps, light uniform toning, a rare flown Graf Zeppelin first day cover; with 1996 Philatelic Foundation certificate.
Scott C13-15
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H.R. Harmer
H.R. Harmer was founded in 1918 by Henry Revell Harmer of London. In 1940, the firm opened its New York auction gallery and quickly ascended to the top ranks of philatelic auction houses... Read More
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