Russia Zeppelin stamps 1931,  10k. - 1p. group of 5 Imperforate cancelled , Cat.V. $300:

1. 10 Russian kopek, Airship in Flight Over Factory, Camel and Reindeer. Mi:SU 397C, Sn:SU C15, Yt:SU PA22(B), Sg:SU 579
2. 15 Russian kopek, Airship Over Dnieper Hydroelectric Plant Under Construction. Mi:SU 398C, Sn:SU C16, Yt:SU PA23(B), Sg:SU 580.
3. 20 Russian kopek, wide right margins, Airship Over Moscow Kremlin, Mi:SU 399C, Sn:SU C17, Yt:SU PA24(B), Sg:SU 581
4. 50 Russian kopek, wide lower margins, Airship Over USSR Map, Mi:SU 400C, Sn:SU C18, Yt:SU PA25(B), Sg:SU 582
5. 1 ₽ - Russian ruble, Designing an Airship. Mi:SU 401C, Sn:SU C19, Yt:SU PA26(B), Sg:SU 583.