This is a rare medallion that sold not long ago for $275 on eBay. The reverse shows the three Monetae, who represent the types of metals used to make coins- bronze, silver and gold.
Crispus
A.D. 317- 324
Ӕ medallion
24gm
CRISPVS NOBIL CAES; laureate bust left, wearing trabea and holding eagle-tipped sceptre.
MONETA VRBIS VESTRAE; three Monetae stg. l.; each holding balance in right hand, cornucopiae on left arm; on the ground, ingots.
RIC VII Rome 70