414 CZECHOSLOVAKIA - POSTAL HISTORY Auction #1839: WORLDWIDE + ARGENTINA: October General Auction Cover / Cat.#: VF. Cover posted on 24/JUN/1937 with nice postmark with slogan topic AVIATION, VF quality! Starting Price: US$ 10 Current Price: US$ 10 Bid US$ 10 or more Closing: 2018-10-25 22:20:00