Portugal
0.11 - 0.13$
price on 07.05.2023
| Country: | Portugal |
| Type: | Postage stamps |
| Series: | Portuguese Productivity Congress |
| Nominal: | 1 $ |
| Year: | 1973 |
| Material: | enamel |
| Size: | 35 x 35 mm |
| Perforation: | comb 14½ |
| Mintage: | 9,000,000 |
Portuguese Productivity Congress
 Graph and computer tapes 0.11$ |  Statistic Numbers 0.33$ |  Statistic Curves 0.36$ |