"Buffalo"

buffalo.  A leather produced in imitation of RUSSIA LEATHER, but of far greater strength than the genuine leather.  It is made from the hide of the large, shaggy-maned North American ox, Bison bison, and was used extensively in covering books in the United States in the latter half of the 19th century.

Bookbinding and the Conservation of Books. Washington:Library of Congress, 1982.