Watch List notes:

KINGS of MACEDON. Antigonos II Gonatas. 277/6-239 BC. AR Tetradrachm (30mm, 16.84 g, 5h). Amphipolis mint. Struck circa 274/1-260/55 BC. Horned head of Pan left, lagobolon over shoulder, in the center of a Macedonian shield / Athena Alkidemos advancing left, holding shield decorated with aegis, preparing to cast thunderbolt; crested Macedonian helmet to inner left, monogram to inner right. Panagopoulou Period I, Group 23, 83 (O17/R80); HGC 3.1, 1042; ANS inv. 1944.100.13842 (same dies). VF, some horn silver. Very rare with this monogram, only three examples noted by Panagopoulou, two in CoinArchives.