AP Royal Oak 26574ST Series Men's Watch: A Perfect Experience of Individuality .1. Diameter: 41MM .2. Equipped with a customized Cal. 5134 movement, perfectly replicating its functionality .3. Features all true functions, including calendar, day, month, and moon phase, all of which operate normally. Available with leather strap option.4. The case is made of 316L stainless steel, with high-precision CNC processing, matching the density of the original.5. The dial presents the original color perfectly.6. The case set consists of three parts: bezel, case, and back cover, showcasing a perfect angle and brushed finish, merging quality with beauty.