Denier - Charlemagne Clusis mint

Clusis — modern Chiusa di San Michele in the Val di Susa — was a strategically critical Alpine pass mint, established precisely because Charlemagne needed to supply and pay his forces moving between Francia and Italy. The deniers struck there before the 793 monetary reform are notably light against the reformed standard, reflecting the transitional weight regime of the early reign. Prou's variant designation for this piece signals a die difference from the main Carolingian sequence, though the exact nature of that variation remains incompletely documented in the literature.