150th Birth Anniversary of Boris Rosing, Inventor
10*32 ₽ 2019
Russia
| Country: | Russia |
| Type: | Postal blocks |
| Series: | 150th Birth Anniversary of B.L. Rosing (1869-1933) |
| Nominal: | 10*32 ₽ |
| Year: | 2019 |
| Size: | 146 x 140 mm |
| Perforation: | comb 12½ x 12 |
| Mintage: | 16,000 |