1971 SC 4021 Baku Oil Industry Scott 3936

1971. Baku Oil Industry.
Catalogs: Scott 3936, Standard Collection 4021, Mi 3967, Yt 3808A.
Condition: MNHOG.
Issued on: December 30, 1971.
Perforation: comb 11½.
Printing: Photogravure.
Size: 28 x 40 mm.
Colors: Multicolor.
Face value: 4 Russian kopek.
Quantity: 3,100,000.