1989 Sc 6028 150th Anniversary of Pulkovo Observatory Scott 5796

1989. 150th Anniversary of Pulkovo Observatory.
Catalogs: Scott 5796, Standard Collection 6028, Michel 5976, Yt 5649.
Issued on: June 20, 1989.
Perforation: comb 11½.
Printing: Photogravure and Recess.
Size: 40 x 28 mm.
Colors: Multicolor.
Face value: 10 Russian kopek.
Quantity: 3,100,000.