1972 Sc 4100 “50th Anniversary of USSR” Philatelic Exhibition Scott 4015

1972. “50th Anniversary of USSR” Philatelic Exhibition.
Catalogs: Scott 4015, Standard Collection 4100, Mi 4050, Yt 3876.
Condition: MNHOG.
Issued on: October 4, 1972.
Perforation: comb 12½ x 12.
Printing: Offset lithography and Recess.
Size: 42 x 30 mm.
Colors: Multicolor.
Face value: 4 Russian kopek.
Quantity: 3,300,000.