1991 Sc 6253-6255 Nobel Prize Winners Scott 5999-6001

1991. Nobel Prize Winners.
Catalogs: Scott 5999-6001, Standard Collection 6253-6255, Michel 6197-6199, Yt 5856-5858.
Condition: MNHOG.
Issued on: May 14, 1991.
Perforation: comb 12¼ x 12.
Printing: Offset lithography and Recess.
Size: 28 x 40 mm.
Colors: Multicolor.
Face value: 3*15 Russian kopek.
Quantity: 3,300,000; 3,300,000; 3,300,000.