U.S.A. (1949) Single engine sky-writer airplane*. One cent bicolor postal card (O) with advertising: "Duplex Envelope Company."
AVAILABLE AT $15
RUSSIA (1931) Biplanes flying over tractor*. Postal card (O) with illustrated advertising "The fifth Osoafiakhim lottery will give 25,000,000 rubles towards strengthening USSR defenses!"
AVAILABLE AT $50
RUSSIA (1933) Plane. Train. Illustrated postal propaganda card (O). Airmail Accelerates Postal Delivery!
AVAILABLE AT $50
GERMANY (1966) Jets at Hannover airport. Postal card (O) with corner illustration.
AVAILABLE AT $15
GERMANY (1968) Gliders in flight at Denkingen. Postal card (O) with corner illustration.
AVAILABLE AT $15