1935, Moscow-San Francisco flight 1r., block of four (positions 2-3,7-8), the bottom stamps with lower case letter "ф" in "San Francisco", upper right stamp (position 3) short "p" of "Francisco", upper stamps with raised dot after "Ceb", never hinged, very attractive and a major rarity, signed Goznak and certificate Buchsbayew AIEP (2011) (Standart 420Ka, 420Kg)
