Pottery Disc

This artifact was surface collected from the beach sands of an eroded shoreline and, although the item is a broken piece of pottery made from firing tempered clay, it is unlikely to have been part of a clay pot.  The object is broken along the upper edge (upper edge as oriented in the photo below) but the edges along the outer circumference of the artifact are not broken as they are smooth, rounded and taper to form a somewhat hexagon shape. The maximum thickness of the piece is at the center with a cross section similar to that of a discus. 

While one side of the pottery disc is plain, the other side contains incised geometric shapes etched into the wet clay prior to firing.  My guess is that this object, prior to being broken, was a discoid, roughly the size of a poker chip.  It may possibly be some sort of a gaming piece.  However, this is pure speculation on my part.