Balchen was a pioneer polar aviator (1899–1973) and chief pilot on Richard E. Byrd’s flight over the South Pole. Chamberlin (1893–1976) distinguished himself as the second pilot to fly a fixed-wing plane across the Atlantic Ocean. Vintage glossy 5 x 3.25 photo of Balchen and Chamberlain in front of Richard E. Byrd’s Fokker F.VII aircraft, signed in the lower border in fountain pen, “Bernt Balchen” and “Clarence Chamberlin.” In fine condition. RR Auction COA.