United States Stamp, 3 cent Byrd Antarctic Expedition from 1933.  Includes stamp mount, as shown in the last image.  Scott 733.  Mint Never Hinged with Original Gum.  The 3 scanned images show the face and reverse of the stamp available.

Please view my other listings on eBay.  I have many other individual stamps, lots of stamps and plate blocks listed for sale at very reasonable prices!