Limited edition of 300 pieces u boat watch chimera day date steel limited edition 7534 movement automatic mechanical modified and personalized to u boat specifications for stem position at 9 oclock 25 jewels power reserve 38 hours frequency 28800 vibrations per hour functions hours minutes sweep second date at 3 oclock and day case aisi 316 plus stainless steel 46 mm diameter the bezel and the back of the case are locked together by external tubing and a customised key that