The exclusive Jacob & Co JCAA05 caliber is partially revealed both on the dial, as well as the case-back side of the Epic X Chrono through smoked crystals. The 260-component caliber offers a combination of highly refined movement decorations on the bridges, self-winding rotor, mainspring barrel, and column wheel.
The column-wheel controls the functioning of the chronograph mechanism inside the Epic X Chrono. Start, stop and reset are all governed by this beautifully hand-finished component: angled, polished and drawn, and fully on show on the case-back side of the JCAA05. Sitting over the exclusive JCAA05 caliber is the anthracite oscillating rotor for the automatic winding of the movement, with red lacquered Jacob & Co Genève engraving. Further decorations include beveled and polished edges on the bridges, perlage circular graining, as well as the open-worked construction of the mainspring barrel, all beautifully executed.