Brazil
0.37 - 0.44$
price on 24.02.2023
2nd South American Radio Conference in Rio de Janeiro/RJ
| Country: | Brazil |
| Type: | Postage stamps |
| Series: | Science and Technology |
| Nominal: | 700 R |
| Year: | 1937 |
| Perforation: | 12½ |
| Mintage: | 400,000 |
Science and Technology
 National Observatory - RJ 0.85$ |  XX International Agency of Atomic Energy Summit 0.26$ |  Guanabara Bay 1.7$ |  Guanabara Bay 0.37$ |