Limited edition of 88 pieces u boat watch chimera 46 skeleton 8028 the u boat chimera 46 steel skeleton is dedicated to the highest level of precision engineering and skilled finishes all u boat watches are hand crafted in italy by master craftsmen and it is this which makes every timepiece so special this u boat chimera 46 skeleton is a self winding mechanical instrument which features a black skeletonized display on an authentic black leather strap a black coated steelbezel stretches 46m