The Tressis denomination
The tressis was an emergency cast bronze denomination worth three asses issued on a triental or quadrantal standard.

It was issued from 215-213 BC.
Tressis

(1) Marcus Antonius 38-37 BC
AE Tressis Achaea
Obverse: M•ANT•IMP•TERT•COS•DESIG•ITER•ET•TER•III•VIR•R•P•C - Conjoined bare heads of Mark Antony and Octavian right, facing draped bust of Octavia left.
Reverse: M•OPPIVS•CAPITO•PRO•PR•PRAEF•CLASS•F•C - Three galleys under sail to right. Γ (Gamma) and Triskeles below.
Ref: RPC I 1463