Watch List notes:

Trebonianus Gallus and Volusian Æ37 'Medallion' of Viminacium, Moesia Superior. Dated RY 13 = AD 251/2. C VIB IO TREBON GALLO AVG IMP C C VIB VOLVSIANVS AV•, laureate, draped and cuirassed busts, vis-a-vis, of Trebonianus Gallus facing right, and Volusian facing left / PMS COL VIM AN XI[II], Trebonianus Gallus on horseback to left, holding spear, Victory standing before holding two palm branches, head and upper body turned backwards, extending one palm towards the emperor; in exergue, bull and lion standing facing. Varbanov 214. 40.99g, 37mm, 12h.

Good Very Fine. Extremely Rare; apparently only the second recorded specimen.