1972 Sc 4053-4056 Lenin pioneers Scott 3968-3971

1972. Lenin pioneers.
Catalogs: Scott 3968-3971, Standard Collection 4053-4056, Mi 4003-4006, Yt 3832-3835.
Condition: MNHOG.
Issued on: May 10, 1972.
Perforation: comb 11½.
Printing: Photogravure.
Size: 41 x 29 mm.
Colors: Multicolor.
Face value: 1 Russian kopek; 2 Russian kopek; 3 Russian kopek; 4 Russian kopek.
Quantity: 4,500,000; 4,500,000; 4,300,000; 3,900,000.