Image #1
WORLDWIDE AIR POST STAMPS AND POSTAL HISTORY
SOVIET RUSSIA (RSFSR AND SOVIET UNION)
Lot #
1138 | 
| Scott # C15-19, C20-24
| 1931 (May 15 and June 8), two Pioneer Flight covers to Germany and USA, franked by complete imperforate and perforated Airships sets, 10k-1r, appropriate markings, the last one with slight fold away from the stamps, mostly VF, Est. $300-$400 . |