In the early days of the linear "fang" the 8 days were mostly manual and the 10 days automatic. However the 8 days 233 I have has at least 10 days power, so I suspect it is a nod to the old 8 days Panerai rather than a different design. 8 - 10 days make sense on a manual, and it's useful to know what is left. Then it can sit in the safe during the week and come out for the weekend and its weekly wind.
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