Olynthos, Macedonia, Chalkidian League, AR Tetradrachm, ca 420-379 BC. 24.8 mm, 14.2 g. 

Laureate head of Apollo right. 
XALKIDEWN, Kithara (lyre) with seven strings. 

SNG ANS 510; HGC 3, 500; Robinson & Clement 122.

With permission of Eidmar auction 3, lot 33 (on biddr.com), March 2024.