1938 Sc 545 Stratosphere Balloon Scott 685

1938. Stratosphere Balloon.
Catalog numbers: Scott 685, Standard Collection 545, Michel 644.
Issued on: October 7, 1938.
Perforation: comb 12¼ x 11¾.
Printing: Typography.
Colors: Multicolor.
Face value: 80 Russian kopek.