Image #1
WORLDWIDE AIR POST STAMPS AND POSTAL HISTORY
UNITED STATES
Lot #
17 | 
| Scott # UC16b
| 1951, DC-4 Skymaster, stationery envelope 10c chocolate on pale blue paper, error of color, 4-line text on reverse, VF and scarce, a common envelope No. UC16 is enclosed, C.v. $450 . |