U boat watch chimera bb mother of pearl 8069 43 mm diameter case in naturally aged bronze and aisi 316 plus stainless steel with subsequent pvd coating treatment distinguishing crown on left side with a patented protective device the bezel and the back of the case are locked together by external tubing and a customised key that ensures absolute water proofing personalized rotor in silver built with a base and 3 bridges fixed with blued screws automatic mechanical modified and personali