1990 Sc 6135-6137 ZOO Relief Fund Scott B166-B168

1990. ZOO Relief Fund.
Catalogs: Scott B166-B168, Standard Collection 6135-6137, Michel 6079-6081, Yt 5742-5744.
Issued on: May 04, 1990.
Perforation: comb 12 x 12¼.
Printing: Offset lithography.
Size: 40 x 28 mm.
Colors: Multicolor.
Face value: 10+5 Russian kopek; 20+10 Russian kopek; 20+10 Russian kopek.
Quantity: 2,700,000.