Portugal
0.62 - 0.74$
price on 07.05.2023
| Country: | Portugal |
| Type: | Postage stamps |
| Series: | Guglielmo Marconi |
| Nominal: | 10 $ |
| Year: | 1974 |
| Material: | Lustrado |
| Size: | 41 x 34 mm |
| Perforation: | comb 12 |
| Mintage: | 1,000,000 |
Guglielmo Marconi
 Diffusion of Hertzian Waves 0.11$ |  Messages through space 0.74$ |  Navigation help 0.62$ |