Charles Steinmetz and Curve on Graph 20 ¢ — United States, 1983
Charles Steinmetz and Curve on Graph (United States, 1983), face value 20 ¢, “American Inventors” series. Photo, catalogue value, details and photo…
- Series
- American Inventors
- Issue date
- 1983
- Face value
- 20 ¢
- Colors
- Multicolor
- Yvert
- US 1497
- Michel
- US 1653
- Stanley Gibbons
- US 2048
- Scott
- US 2055