1925 cover from Basel to USA, franked with 1fr violet and on arrival in San Francisco a 24c Jenny was added and canceled by oval "San Francisco Ferry" pmk, apparently paying for the second leg of the flight from New York, fine and interesting item (Image)

Est.US$500

1937 20c green, imperforate, sheet margin single, l.h., v.f., with 1977 Rellstab certificate (Zumstein 4z, catalogue value for hinged) cat. $5000 (Cat No. C4a,var) (Image)

Cat. $5000, Est.US$2,500