Edition type: definitive stamp
Denomination: 30 c
Date of issue: 1931 Sep. 8
Depiction: Bison (Bison bison)
Artist: Charles Robert Knight
Designer: Clair Aubrey Huston
Engraver: Louis Schofield
Perforation: lin. 10,5:11
Printing process: rotary press steel engraving
Size of a stamp (mm): 22*26
Size of a sheet (mm):
Sheet composition: 100 (10*10) stamps
Printing run: 340 000 000
Stamp issuing authority: United States Postal Service
Printer: Bureau of Engraving and Printing
Issue City was Washington, District of Columbia.
The 30-cent Buffalo issue is the only stamp of the Regular Issue series 1922-1934 that does not have a ribbon-banner and title directly below the central image of the stamp.
Photo of wash drawing of bison by Charles Robert Knight (1874–1953), Made in Washington Zoo, 1901.