Limited edition of 300 pieces u boat watch chimera 46 black bronze limited edition movement top soigne with black screws rhodium plated automatic mechanical chronograph personalized to u boat specifications for date display and stem to be positioned at 9 o clock frequency 28800 vibrations per hour 4 hz power reserve 44 hours 25 jewels height 7 mm functions hours minutes chronograph counter small seconds at 3 counter 12h at 12 counter 30 minutes at 6 date window at 9 oclock