Watch List notes:

Quintillus. AD 270. Antoninianus (20mm, 3.04 g, 6h). Rome mint, 10th officina. Radiate, draped, and cuirassed bust right / Mars advancing left, holding olive branch and spear; X to left. RIC V 24 var. (not cuirassed); Bland, Beachy 1534. VF.

Reportedly from the 1961 Beachy Head Treasure Trove.