BLK's latest Rolex Yacht-Master series in 40mm/42mm features a calendar function that supports both forward and reverse adjustments! The window distance matches the genuine model with our exclusive custom 3235 integrated movement, ensuring stable and reliable performance.1. Case: The dimensions and thickness are identical to the original, making market versions easily recognizable as fakes.2. Dial: Top-grade Swiss ice blue luminescence, with a finely detailed texture and matching colors; incredibly strong moonlight, the king of the night!.3. Glass: Sapphire glass with a 2.5x magnifying effect, providing excellent transparency and clearer font.4. Strap: Fluoroelastomer strap, perfectly fitting the lugs for maximum comfort on your wrist. Ordering the promotional strap version also comes with a complimentary natural rubber strap, a guaranteed premium product; every intricate detail is crafted with BLK's dedication.With top-notch craftsmanship, trust the unique BLK serial number and distinctive design. Quality assurance, high quality, and premium products!