The caliber O3.05-C first appeared in the Mille Miglia 2016 XL Race Edition and hails from Chopard's Fleurier Ebauches factory a manufacturing center in the town of Fleurier. It's a column-wheel flyback chronograph as I mentioned and it runs at a standard rate of
link 4 Hz while delivering a respectable 60 hours
link of
link power reserve.