1951 Sc 1540-1555 First printing. Famous Russian scientists Scott 1568-1583

1951. Famous Russian scientists. First printing. Stamps of first and second issues have different size (usually 1 mm difference by height). For example, height of the first stamp of the set: first printing – 33m, second – 32mm. Feel free to ask us, if you don’t have a specialized catalog.

Catalog numbers: Scott 1568-1583, Standard Collection 1540-1555, Michel 1575-1590.
Perforation: line 12½.