1987 Sc 5766-5768 River Fleet of the USSR Scott 5557-5559

1987. River Fleet of the USSR.
Catalogs: Scott 5557-5559, Standard Collection 5766-5768, Michel 5714-5716, Yt 5406-5408.
Issued on: May 20, 1987.
Perforation: comb 12 x 11¾.
Printing: Photogravure.
Size: 55 x 26 mm.
Colors: Multicolor.
Face value: 5 Russian kopek; 10 Russian kopek; 30 Russian kopek.
Quantity: 4,900,000; 3,700,000; 3,700,000.