Complete set, Cartier, Ballon Bleu, model: WGBB0017, automatic mechanical, 18k rose gold, diameter: 42.1mm, 3. Material: 18K gold case, bezel and crown, all made of precious metals Dial: Silver-white radial dial, black Roman numeral hour markers, blue steel hands, date display window at 3 o 'clock Signature design: Side raised sapphire crown, curved convex sapphire crystal Strap: Black matte fish skin, gold pin buckle Movement: Cartier 1847MC automatic mechanical movement, 42-hour power reserve 1847MC movement: Cartier's classic self-produced automatic movement, stable and durable, with anti-magnetic adjustment, and low failure rate during daily commuting The core of recognition: The blue onion-shaped crown and spherical crystal are the signature elements of the Blue Balloon, making it highly recognizable for both business and daily wear All-gold texture: The entire 18K gold looks visually luxurious, distinct from the interlaced gold and stainless steel models, and has a stronger value retention attribute