Arctic: MacMillan-Byrd Expedition 1925: Envelope carried on the first leg of the expedition with purple four line “AIR MAIL/Phila - Boston/VIA/MacMillan Expedition” cachet, addressed to Boston bearing 2c. cancelled by Philadelphia Navy Yard Station June 9 duplex with Boston June 11 duplex alongside and on reverse. Photo. (Image1)

Arctic: MacMillan-Byrd Expedition 1925: Very small envelope endorsed “Via/US Navy/Plane/Lt. Com./R.E. Byrd” in red, carried and signed by Byrd, addressed to the base at Etah, Greenland with Lexington-Concord 2c. tied to reverse by one of two fine strikes of “U.S.Navy/(anchor)/Polar Expedition” cachet. Rare. Photo. (Image1)

Arctic: MacMillan-Byrd Expedition 1925: U.S. 1c. postal stationery card, cancelled by Philadelphia Navy Yard Station June 10 duplex, with typed account on reverse confirming having been carried on the attempted Polar flight, signed by both Byrd and MacMillan and with double oval “MACMILLAN AERIAL/POLAR/1925/MAIL/ARCTIC EXPEDITION” cachet in blue. Rare. Photo. (Image1)

Arctic: MacMillan-Byrd Expedition 1925: U.S. 1c. postal stationery card, cancelled by Philadelphia Navy Yard Station June 10 duplex, with typed account on reverse confirming having been carried on the attempted Polar flight, signed by both Byrd and MacMillan and with double oval “MACMILLAN AERIAL/POLAR/1925/MAIL/ARCTIC EXPEDITION” cachet in blue. Rare. The property of another vendor. Photo. (Image1)

Arctic: MacMillan-Byrd Expedition 1925: Two unused ‘homemade’ real photographic postcards showing expedition ships “Peary” and “Baudouin” respectively. Taken at Wiscasset, Maine before departure on June 20. Photo. (Image1)