Numbers and letters on the back cover of Tissot Watch plus the number *** 10. Its serial number is a set of numbers consisting of English+Arabic numerals on the back cover of the watch. From the appearance of Tissot watch, the dial, back cover, Tissot logo and Tissot brand of genuine watch are clear and complete; The number of drills marked on the dial is consistent with the actual number of drills of the movement; The back cover is made of the same material as the case; Watch glass is bright and clear; The outer edges and corners of the housing assembly are not sharp. The coating has no bubbles and does not fall off.