Olynthos, Macedonia, Chalkidian League, AR Tetradrachm, ca 420-379 BC. 25.2 mm, 14.2 g. 

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

SNG ANS 481-482; HGC 3.1, 497-499; AMNG III/2, 4; BMC 3.

With permission of Eidmar auction 3, lot 32 (on biddr.com), March 2024.