Watch List notes:

MACEDON, Mende. Circa 510-480 BC. AR Tetrobol (15mm, 2.69 g). Ithyphallic ass standing left / Incuse square of mill-sail pattern. Michaux Group 1, 3 var. (D–/R3 [unlisted obv. die]); HGC 3.1, 552 (same rev. punch as illustration). Good VF, lightly toned, slight roughness.

From the Belgica Collection. Ex Classical Numismatic Group Electronic Auction 230 (24 March 2010), lot 12.