Denier - Otto I / Otto II / Otto III Mainz mint

The Mainz deniers struck under the three Ottos occupied a politically charged mint. Mainz was the seat of the Archbishop, who held both ecclesiastical primacy in the German church and, from 965 onward, the archchancellorship of Germany — making the mint's output as much a statement of episcopal power as imperial authority. Attribution among Otto I, II, and III issues at this mint remains genuinely difficult; the dies changed slowly, and the same types persisted across reigns with minimal modification, which is precisely why Kluge groups them under a single Karolingian-continuity classification.