BLK's latest Rolex Yacht-Master series in 40mm/42mm features a calendar that supports both forward and backward adjustments! The watch is equipped with the exclusive custom 3235 integrated movement, ensuring stable and reliable performance. Quality assurance is guaranteed.1. Case: The thickness and dimensions are consistent with the original, making market versions easily identifiable as fakes.2. Dial: Features top-grade Swiss ice blue luminous material with a delicate texture and accurate color matching; it boasts an impressive moonlight effect-truly the king of the night! .3. Glass: Sapphire glass with a 2.5x magnifying effect, offering clear visibility and improved font clarity.4. Strap: Made of fluororubber, each strap perfectly fits the lugs, providing maximum comfort for your wrist. Orders of the welfare strap version come with a complimentary natural rubber strap, a guaranteed premium product. Every exquisite detail is a testament to BLK's dedication to craftsmanship. With first-class workmanship, trust the unique BLK serial number and distinctive design. Quality assurance, high-end products of superior quality!