Western Asia Minor PB 1 Stater Weight. Circa 4th-3rd centuries BC. Large ΣΤ / Blank. Pondera online 3232 (Çanakkale Archaeological Museum) 18.74g, 19mm x 23mm.
Condition as seen.
From the inventory of a German dealer.
The ΣΤ stands for 'stater' (ΣΤΑΤΗΡ).