Replica five cent coin, in matte finish dark copper and brown/black metal. Warm brown color is quite dark on this small button, and the buffalo image is somewhat subdued.  Shank opening is about 2.5mm.   3/4" / 20 mm, which is the same size as a genuine old silver Buffalo/Indian nickel. (which we also have).

Lead-free zinc alloy, made in Italy.  Limited supply.