1966 Sc 3229. 20 anniversary of the Treaty of friendship between the USSR and Mongolia. Scott 3159

1966. To the 20 anniversary of the Treaty of friendship between the USSR and MNR (Mongolian National Republic)
Catalog numbers: Scott 3159, Standard Collection 3229, Michel 3179, Yvert 3063.
Perforation: comb 12¼.
Color: Multicolor.
Printing: Offset lithography.
Print run: 3,000,000.