Robert von Lieben (1873-1913): electrons amplifier tube 60+60 Austrian groschen — Austria, 1936
Robert von Lieben (1873-1913): electrons amplifier tube (Austria, 1936), face value 60+60 Austrian groschen, “Inventors” series. Photo, catalogue value…
- Series
- Inventors
- Issue date
- 1936
- Face value
- 60+60 Austrian groschen
- Colors
- Violet blue
- Print run
- 130,000
- Yvert
- AT 493
- Michel
- AT 636
- Stanley Gibbons
- AT 802
- Scott
- AT B150