Obol Undetermined Friesach marks

Friesach pfennigs — of which this obol is the half-unit — became the dominant trade currency across much of the eastern Alpine region and the Balkans during the twelfth and thirteenth centuries, circulating far beyond the borders of Carinthia into Hungary, Serbia, and the Latin states of the eastern Mediterranean. The Archbishop of Salzburg and the Duke of Carinthia both held minting rights at Friesach simultaneously, which created a proliferation of types so tangled that attribution remains genuinely contested — hence the "undetermined marks" classification here.