Not Thessaly but Thessalonica like this from Wildwinds. Thessalonica, Macedonia, AE23. After 168 BC. Laureate, draped bust of Hermes right, caduceus at shoulder / ΘEΣΣAΛO-NIKHΣ to left and right of Pan, naked, standing left, right hand raised to his head, goat-skin hanging from left arm. ΠYAE monogram to left. BMC 4.
Thanks! That is officially the oldest coin I own. I wish it had its original patina, but still.... I like it.