Snake Button, 15/16" Silver Metal Button, 23mm Shank Back #FJ-118

Not a diamondback; perhaps a circle-back?  Dimensional detail with matte silver and black. Made from lead- free zinc alloy, it's slightly shiny, with an almost round, irregular shape and the shank opening is around 3mm. Made in Italy;  the quality is excellent. They are quite consistent button to button. Limited Supply; they're no longer being made. $2.75 each.