Portugal
0.69 - 0.83$
price on 07.05.2023
| Country: | Portugal |
| Type: | Postage stamps |
| Series: | Subsoil - Cycle of Natural Resources |
| Nominal: | 20 $ |
| Year: | 1977 |
| Material: | Esmalte |
| Perforation: | comb 12 x 11¾ |
| Mintage: | 500,000 |
Subsoil - Cycle of Natural Resources
 Pyrites 0.07$ |  Marbles 0.21$ |  Iron Ore 0.34$ |  Uranium ore 0.69$ |