U-Boat Watch Capsoil 45 Chrono DLC 8109/D. 45 mm case with black DLC treatment, CAPSOIL features an electromechanics, with Chrono functions, completely immersed in an oil bath. The oily liquid, surrounding the dial, transforms it into an absolute black, making it three-dimensional and deep. This fluid creates on the dial an ever-moving compensation bubble. This new version features an innovative locking system (Locking ring system) with quick battery replacement.