1951 Sc 1541(2) Nikolay I. Lobachevsky Scott 1575

1951. Nikolay I. Lobachevsky.
Raster: Horizontal.
Catalogs: Scott 1575, Standard Collection 1541(2), Michel 1584.
Issued on: 1951.
Perforation: line 12½.
Printing: Photogravure.
Face value: 40 Russian kopek.