5A Quality Mechanical Watch - High-Quality Automatic Eta Stainless Steel Sapphire Mechanical Watch Mechanical Watch Wholesale Watch. Sapphire Crystal Window: Dial window made of durable Sapphire Crystal for scratch resistance. 10 Bar Water Resistance: Waterproof depth up to 10 bar (100 meters) suitable for swimming. Ultra Long Battery Life: Battery life lasts up to 72 hours on a single charge. Fast Delivery for Stock: Existing inventory ships within 2 days, faster than typical suppliers. Customization Services: Offers mould making, sample making, and flexible customization options. High-Quality Components: Movements and batteries sourced from Japan and Switzerland for stability. Lifelong After-Sales Support: Provides solutions for any after-sales problems with lifelong service. Low MOQ for Inventory: Minimum order quantity is just 1 piece for ready-made stock items.