Watch List notes:

Magnentius. AD 350-353. Æ Centenionalis (18mm, 4.16 g, 6h). Converted into a gaming token(?). Uncertain mint. Bareheaded, draped, and cuirassed bust right / Large Christogram; A-ω flanking. Brown patina, reddish earthen encrustation, cut into a cog-shaped token/game piece. Fine. Interesting contemporary use of a mid 4th century Roman Bronze coin.