Marconi's Spark Coil and Spark Gap 6 ¢ — United States, 1973
Marconi's Spark Coil and Spark Gap (United States, 1973), face value 6 ¢, “Electronics Progress Issue” series. Photo, catalogue value, details and photo…
- Series
- Electronics Progress Issue
- Issue date
- 1973
- Face value
- 6 ¢
- Colors
- Multicolor
- Print run
- 53,000,000
- Yvert
- US 994
- Michel
- US 1113
- Stanley Gibbons
- US 1505
- Scott
- US 1500