Watch List notes:

ACHAIA, Achaian League. Megalopolis. Circa 160-146 BC. Tetrobol (Silver, 18 mm, 2.30 g, 7 h). Laureate head of Zeus to right. Rev. Achaian League monogram; across field, K-I ; below, syrinx below, above, Ξ; all within wreath. BCD Peloponnesos 1550. Benner 15. HGC 5, 953. Toned. Very fine.

From an old Swiss collection, formed circa 1950s to 1970s.