William T. Piper 40 ¢ — United States, 1991
William T. Piper (United States, 1991), face value 40 ¢, “Aviation Pioneers” series. Photo, catalogue value, details and photo identification.
- Series
- Aviation Pioneers
- Issue date
- 1991
- Face value
- 40 ¢
- Colors
- Multicolor
- Print run
- 182,000,000
- Yvert
- US PA122
- Michel
- US 2135A
- Stanley Gibbons
- US A2576
- Scott
- US C129