Limited edition of88 piecesr u boat watch chimera 43 925 emerald limited edition innovative steel crown release system patented at 8 oclock for easy time and date settingautomatic mechanical movement modified and personalized to u boat specifications for stem position at 9 oclock height 4 60 mm 25 jewels power reserve 38 hours frequency 28800 vibrations per hour 4 hzr strap is hand made and hand finished alligator black decorated with an inset made of silver and precious st