1938 Sc 517 Portrait of I. Papanin, E. Krenkel, P. Shirshov & E. Fedorov Scott 645

1938. Portrait of I. Papanin, E. Krenkel, P. Shirshov & E. Fedorov.
Catalog numbers: Scott 645, Standard Collection 517, Michel 616.
Issued on: June 21, 1938.
Perforation: line 12¼.
Printing: Photogravure.
Colors: Multicolor.
Face value: 30 Russian kopek.