watch men bp factory ceramic bezel 40mm cosmograph 116500 116520 116506 chronograph cal.7750 4130 movement mechanical automatic men's w, Slivery;brown

the internal function of the new mechanical watch is almost zero, and it needs to be manually wound before wearing it for the first time stainless steel is resistant to falling but not abrasion-resistant, so small wear marks are prone to appear adjust the calendar: please do not actively adjust the calendar between 22.00~2.00, this may cause damage to the movement.syi