Airship constructing in USSR. Extremely rare variety – imperforated. Mint, never hinged, full original gum. No any defects, FV grade. Photo-certificate can be issued on request. Other methods on request. Or Mint never hinged: stamps with original gum (OG), undamaged/ disturbed by hinge. Mint – mint with gum (or w/o gum if issued as such) […]