1972 Sc 4103-4107 50th Anniversary of USSR Scott 4018-4022

1972. 50th Anniversary of USSR.
Catalogs: Scott 4018-4022, Standard Collection 4103-4107, Mi 4053-4057, Yt 3879-3883.
Condition: MNHOG.
Issued on: October 28, 1972.
Perforation: comb 12 x 11½.
Printing: Photogravure.
Size: 37 x 52 mm.
Colors: Multicolor.
Face value: 5*4 Russian kopek.
Quantity: 4,200,000; 4,100,000; 4,100,000; 4,000,000; 3,700,000.