Tetradrachm Atta Type

West Noricum occupied the eastern Alps between roughly the Salzach and the Sava, a region whose Celtic tribes controlled significant silver sources and trade routes connecting the Mediterranean world to the Danube corridor. The "Atta" types represent a late phase of Noric coinage, progressively abstracting their prototypes — ultimately derived from Macedonian tetradrachms of Philip II — across generations of die-cutting until the imagery became almost unrecognizable.

Kostial 138 sits within a classification system that remains contested; attribution to specific tribal groups within West Noricum is largely inferential, based on findspot concentrations rather than any written record.