Obol Undetermined Friesach marks

Friesach pennies — and their fractional obol derivatives — were among the most widely circulated coins in the medieval eastern Alpine and Adriatic trade zone, accepted well beyond Carinthian borders into Hungary, Bohemia, and the Dalmatian coast. By the mid-thirteenth century, the type had been so extensively imitated by regional ecclesiastical and secular authorities that attribution to a specific issuer is often impossible without die-linking studies. The "undetermined marks" designation here reflects exactly that problem.

The Duchy of Carinthia changed hands between the Sponheim and Habsburg spheres during this period, complicating mint authority records further.