1975 Sc 4409 30th Anniversary of Soviet-Polish Friendship Scott 4331

1975. 30th Anniversary of Soviet-Polish Friendship.
Condition: MNHOG.
Catalog numbers: Scott 4331, Standard Collection 4409, Michel 4364, Yvert 4151.
Issued on: May 23, 1975.
Perforation: comb 11½.
Printing: Photogravure.
Size: 40 x 28 mm.
Color: Multicolor.
Face value: 6 Russian kopek.
Quantity: 4,000,000.