1968 Sc 3556-3557. Advisory commission of post studying of the World postal union (Moscow). Scott 3483-3484

1968. Advisory commission of post studying of the World postal union (Moscow).
Catalogs: Scott 3483-3484, Standard Collection 3556-3557, Michel 3508-3509, Yt 3367-3368.
Issued on: 1968-06-30.
Perforation: comb 12¼ x 12
Printing: Photogravure
Size: 42 x 30 mm
Colors: Lilac-brown and gray. Red-brown and yellow-olive
Face value: 6 Russian kopek
Print run: 4,000,000