1916, Centenary of the Declaration of Independence, enlarged artist's proof of 5c in black on thickened paper, size 135x115mm, mounted on black and red colored papers, VF and very rare, Est. $250-$400

200.00

Air Post stamps 1930, green Zeppelin overprints on the First Air Mail - Birds issue, 20c-1.80p, complete set of five, full OG, NH (20c, 50c and 90c) or hinged, mostly VF, C.v. $766 as hinged, Est. $350-$500

250.00

Zeppelin Flight 1930 (May 28-June 6), First Pan America Return Flight cover, posted at Recife to Friedrichshafen, addressed to Czechoslovakia, franked by four stamps with blue Zeppelin overprints, American confirmationmarking, Friedrichshafen drop and Prague arrival ds on reverse, mostly VF, Est. $150-$200

100.00