1972 Sc 4050 250th Anniversary of Izhora Factory Scott 3965

1972. 250th Anniversary of Izhora Factory.
Catalogs: Scott 3965, Standard Collection 4050, Mi 4000, Yt 3828.
Condition: MNHOG.
Issued on: April 20, 1972.
Perforation: comb 12½ x 12.
Printing: Photogravure.
Size: 42 x 30 mm.
Colors: Multicolor.
Face value: 4 Russian kopek.
Quantity: 3,000,000.