MACEDON. Kingdom of Macedon. Antigonus II Gonatas, 277-239 B.C. AR Tetradrachm (17.02 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. Bold strike with excellent centering. Lustrous and quite attractive.