If you're going for realism rather than convenience then you could think about using a non-decimal currency. 1, 12, 240 could work well (Pennies, shillings, pounds). You could also have different cities using different currency. Probably best to stick to 3 or 4 major denominations for sake of convienience, but there's no reason why you couldn't have other rare coins worth different amounts to add interest and realism.
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