1938 Sc 502II Portrait of crew of ANT-25 and route of flight Scott 641

1938. Portrait of crew of ANT-25 and route of flight.
Catalog numbers: Scott 641, Standard Collection 502II, Michel 600.
Issued on: April, 1938.
Perforation: line12¼.
Printing: Collotype.
Colors: Multicolor.
Face value: 20 Russian kopek.
Quantity: 4,400,000.