BLK's latest Rolex Yacht-Master series in 40mm/42mm features a calendar with both forward and backward adjustment! It is equipped with an exclusive custom-made 3235 integrated movement, ensuring stable and reliable performance; quality assurance.1. Case: The size and thickness are consistent with the original, making market versions easily identifiable as fake.2. Dial: Top-grade Swiss ice blue luminescence with a delicate texture and color matching; exceptional moonlight. The king of the night! .3. Glass: Sapphire glass with a 2.5x magnifying effect, providing clarity; the font is clearer.4. Strap: Fluoroelastomer strap, perfectly fitting the lugs for maximum comfort on the wrist; orders for the promotional strap version come with a complimentary pair of natural rubber straps, guaranteed to be a premium product. Every exquisite detail reflects BLK's dedication to craftsmanship; first-class workmanship, recognized by BLK's unique serial number and distinctive design. Quality assured, high-quality, high-end products!