1969 Sc 3684. 100 anniversary of the Periodic law of D.I.Mendeleyev. Scott 3607

1969. To the 100 anniversary of the Periodic law of D.I.Mendeleyev.
Catalogs: Scott 3607, Standard Collection 3684, Michel 3634, Yt 3501.
Issued on: 1969-06-20.
Perforation: comb 12½ x 12
Printing: Photogravure and Recess
Size: 52 x 37 mm
Colors: Brown and carmine
Face value: 6 Russian kopek
Print run: 4,000,000