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men's fully automatic mechanical watch. winding: 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 error:the error of the mechanical watch is within 24 hours and 30 seconds, which belongs to the normal error range.syi