Portugal
0.28 - 0.34$
price on 07.05.2023
| Country: | Portugal |
| Type: | Postage stamps |
| Series: | 1st Congress Hispano-Luso-American Economic Geology |
| Nominal: | 3.50 $ |
| Year: | 1971 |
| Material: | Polished |
| Size: | 40 x 22 mm |
| Perforation: | comb 12 |
| Mintage: | 3,000,000 |
1st Congress Hispano-Luso-American Economic Geology
 Wolframite 0.09$ |  Arsenopyrite 0.29$ |  Beryllium 0.28$ |  Chalcopyrite 1.3$ |