Edwin Armstrong and Frequency Modulator 20 ¢ — United States, 1983
Edwin Armstrong and Frequency Modulator (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
- Print run
- 48,000,000