Protocontorniate

A protocontorniate is a normal, usually large-module bronze coin, typically a sestertius, which at some point was later altered by hammering the edges of the coin so that it could serve some other use. A common assumption is that protocontorniates functioned as game counters since the rim created through hammering could protect the designs. Andreas Alföldi believed protocontorniates to be forerunners of the contorniates of the fourth and fifth centuries. He argued that protocontorniates were New Year's gifts and that the older coins were actually hammered in the fourth century before the contorniates proper came into being.