painted in red and yellow, figure with red bands across mouth; central mirror surrounded with rows of tacks; ermine tails, horsehair and ribbons hang from all four limbs; the haft wrapped with otter fur

length 33-1/4 inches

For a similar example:
Ewer, John. Plains Indian Sculpture (1986: 198, fig 194)

A nearly identical example was photographed by O.S. Goff, ca 1886 showing a dancer holding this style board   (National Archives, 111-SC-83716).