Watch List notes:

ACHAIA, Achaian League. Messene. Circa 175-168 BC. AR Triobol – Hemidrachm (17mm, 2.39 g, 7h). Laureate head of Zeus right / Achaian League monogram; O to left, OP above, N to right, M below; all within wreath. Benner 23; BCD Peleponnesos, 724; HGC 5, 596. Toned, a few minor scratches. VF.

From the Professor Charles Schulz Collection, purchased from Herakles Numismatics, May 2000.