MACEDON. Kingdom of Macedon. Antigonus II Gonatas, 277-239 B.C. AR Tetradrachm (16.79 gms).SNG Cop-1199. Macedonian shield motif with left facing head of Pan in center; Reverse: Helmeted Athena advancing left armed with shield and thunderbolt, monogram to right, Macedonian helmet to left. Crisp strike details on a broad flan.NGC AU, Strike: 5/5 Surface: 3/5.