50 Kop dark brown, 1 Rub dark green imperforated air ships 1931 on registered airmail cover to Lorch, ZKr MOSKVA A -25.5.31 50 POTSCHTOWOYE OTDELENIE, red arrival postmark ZKr with airmail transported airmail office BERLIN C2, transit postmark Berlin C (26.5.31) and arrival postmark Lorch (27.5.31), both at back, minimal foxed