Portugal
0.62 - 0.74$
price on 07.05.2023
| Country: | Portugal |
| Type: | Postage stamps |
| Series: | 400th Death Anniversary of Pedro Nunes |
| Nominal: | 20 $ |
| Year: | 1978 |
| Material: | Phosphorescent Enamel |
| Perforation: | comb 12 x 11½ |
| Mintage: | 600,000 |
400th Death Anniversary of Pedro Nunes
 Pedro Nunes 0.11$ |  Nonio (navigation instrument) and diagram 0.62$ |