1975 Sc 4389 Centenary of International Metre Convention Scott 4304

1975. Centenary of International Metre Convention.
Catalogs: Scott 4304, Standard Collection 4389, Mi 4337, Yt 4126.
Condition: MNHOG.
Issued on: March 14, 1975.
Perforation: comb 11½.
Printing: Photogravure.
Size: 40 x 28 mm.
Colors: Multicolor.
Face value: 6 Russian kopek.
Quantity: 4,200,000.