Faustina II, AE medallion, 37 mm, 52 g. Rome.

FAVSTINA AVG PII AVG FIL, draped bust left.
No legend, Venus seated left on stool, holding a helmet towards Mars standing before her, right hand at his shoulder, fastening the strap for his sword, his cuirass at foot left.

Weber (DE) 1658; de Sartiges 271. Cohen -; Gnecchi -; BMC -.

Very rare.
Image from the de Sartiges catalog.