485 COSTA RICA - AIRMAIL Auction #1839: WORLDWIDE + ARGENTINA: October General Auction Lot / Mint O.Gum (LH) Cat.#: YvertA.48/49 var. VF. Yvert 48 + 49, both with INVERTED OVERPRINT, very fine quality! Starting Price: US$ 50 Current Price: US$ 55 Bid US$ 61 or more Closing: 2018-10-25 22:20:00