circa 1920 | hide, glass, metal
circa 1930–1940 | semi-tanned hide, commercially tanned leather, glass, cotton thread
early 20th century | leather, glass, sinew
1930–1940 | semi-tanned hide, rawhide, glass, pigment, sinew
late 19th century–early 20th century | rawhide, semi-tanned hide, glass, cotton
