Stratos, Akarnania, AR Hemidrachm, 15mm, 2.10g. 420-400 BC. 

Head of the river-god Acheloos right.
KALLIROA around large F. 

Traité II-4, 11; BCD 6. BMC 2 (under Oinadae); Imhoof 4 (ditto)
Rare

Sold by Solidus Numismatik, auction 6, Lot 91, July 2015.