1935 Felix Vaitkus' Trans-Atlantic attempt cover franked with US 6c orange (Sep 21) and special overprinted adhesive, also two additional stamps on back, tied by Kaunas (31 Oct) return trip to Kohler, Wisconsin, numbered "492" and signed by Lt. Felix Vaitkus, with violet cachet, registry handstamp and other appropriate markings, fine-v.f. (Cat No. C80var) (Image)

Est.$500