Nikolay I. Lobachevsky (1792-1856), Russian Mathematician
40 k 1951
USSR
Stamp reissued in 1955/56 with slightly smaller dimensions.
| Country: | USSR |
| Type: | Postage stamps |
| Series: | Famous Russian scientists |
| Nominal: | 40 k |
| Year: | 1951 |
| Size: | 27 x 38 mm |
| Perforation: | line 12½ |
| Mintage: | 1,000,000 |
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