The Chalkous denomination
The chalkous (plural: chalkoi) was an ancient Greek bronze coin denomination. The chalkous was the smallest fraction of a coin in Greek poleis, but the weight varied. In Athens one obolos equalled 8 , in Delphi and Epidaurus 12 , and in Priene 16 chalkoi.

Other denominations based on the Chalkous were struck, e.g. the tetrachalkon, the dichalkon, and the hemichalkon.
Chalkous

(1) Mygissos 350-300 BC
Obverse: laureate head of Poseidon right
Reverse: dolphin right, trident below; MY
Ref: SNG Kayhan 857 (Myous); SNG Cop. 10...
(2) Pelinna c. 425-350 BC
Obverse: Horseman left, striking at fallen Hoplite with javelin
Reverse: Warrior advancing left, holding shield ΠEΛINNA_ION
Ref: Rogers 427; BCD Thessaly 520; SNG C...