SJ Productions Dandong 4131 4130 Movement .Dandong 7750 .FH Factory Rolex Daytona Series LX1 Cost-effective Weighted Daytona, featuring an internal weight that won't peel or fade. The entire watch weighs 145g and is gold-plated! Options available with Dandong 7750, Shanghai 4130, and 4131 movements; thickness is only 12.2MM, not the thickened version; bezel, dial, hands, case, strap, and clasp are all top-quality replacement parts; details are excellent, and colors match perfectly! No need for further explanation - high quality - reasonable price - pursuing quality while being cost-effective! S1 exquisitely recommends this multifunctional mechanical watch for men.