Spiral wave radiation pattern 4.50 $ — Portugal, 1974
Spiral wave radiation pattern (Portugal, 1974), face value 4.50 $, “Satellite Communications Station Network” series. Photo, catalogue value, details and…
- Series
- Satellite Communications Station Network
- Issue date
- 1974
- Face value
- 4.50 $
- Colors
- Black blue
- Print run
- 1,000,000