SJ Production .Produced by C Factory/Clean, the Rolex Daytona series 40mm MK1 is a must-have masterpiece. It features an updated custom super-strong integrated material, with an integrated case and clasp, making the watch easier and quicker to wear, providing a comfortable experience.This is a customized version of the Rolex Cosmograph Daytona series with an integrated case. The watch is not only lightweight but also has a sturdy exterior, with each watch offering a unique wearing experience! .The case dimensions of the watch are 40X12.4, matching the original specifications, showcasing C Factory's exceptional craftsmanship in creating the unique charm of Rolex. Exclusively available in the market, the entire case, bezel, and back cover are made from high-composite materials and super-strong luminous powder. The details have been hand-polished with chamfering, resulting in an extraordinary texture. The strap and clasp are made from natural materials, ensuring breathability, comfort, and a soft feel. The movement uses the genuine 4130 integrated movement, perfectly achieving powerful functionalitytruly a king of cost-performance! .Trust in C Factory quality; the watch code is C2PC11SA, with the latest back cover labelpictures available for proof, quality guaranteed. This is the strongest version, S1, highly recommended for men's multifunctional mechanical watches.