Vacheron Constantin, Wu Wu type, model: 4000E / 000R-B065 Retro style wristwatch, 18K rose gold material, coffee dial, day, month, calendar and moon phase display, 22K rose gold Maltese cross skeleton rotor • Size parameters: 40mm in diameter, 11.6mm in thickness, suitable for most wrists, no problem when worn formally • Waterproof performance: 30 meters, meeting the basic waterproof requirements for daily wear Core configuration and functions • Movement: Equipped with Vacheron Constantin's self-produced Cal.2460 QCL / 1 automatic winding movement, certified by Geneva, featuring 27 jewels, a power reserve of 40 hours, a frequency of 28,800 vibrations per hour, and precise and stable timekeeping • Core functions: Full calendar display (day / month window, pointer-style date) + precise moon phase, with a moon phase accuracy of up to 122 years that only needs to be adjusted once, and also supports stop-second function • Material details: 18K 5N rose gold case / bezel / clasp, dark brown dial paired with the same color calfskin strap, hour markers and hands coated with blue luminescent material, clear time reading at night • Design highlights: The lugs incorporate the brand's signature Maltese cross shape element. The transparent sapphire case back allows one to appreciate the polishing of the movement. The blue steel date hands and the moon phase dial create a visual echo, balancing retro aesthetics with modern texture The design integrates retro aesthetics with modern style, making it suitable for both business formal occasions and casual wear, with extremely strong style compatibility