The Edox Hydro-Sub Date Automatic Chronometer, reference 80128-3BUM-BUIO, is a premium Swiss diving watch, released in a limited edition of just 500 pieces worldwide. It revives the legacy of the legendary original Hydro-Sub model from 1965, combining a retro-athletic design with modern standards of high chronometric precision. Key Technical Features • High-Precision Movement: It is equipped with the Edox 806 caliber (based on the reliable Sellita SW200 movement). The movement is officially COSC-certified (Chronometer), guaranteeing a precision of -4/+6 seconds per day. It has a power reserve of 38 hours and runs at 28,800 vibrations per hour (4 Hz). • Case Construction and Dimensions: The case is made of 316L stainless steel, with a diameter of 42 mm, a comfortable thickness of 12.5 mm, and a lug-to-lug distance of 20 mm. • Dial Design and Aesthetic Elements: This specific model stands out with a deep blue dial, elegantly contrasted by luminous hands and hour markers with orange accents. The dial features a discreet date window at the 3 o’clock position. • Deep Water Resistance: It offers a pressure resistance of 300 meters (30 ATM) and is fully certified for professional diving. Protection against water ingress is ensured by a screw-down crown equipped with Edox’s patented double O-ring system. • Premium Materials: The dial is protected by a sapphire crystal with an anti-reflective coating on both sides for maximum readability. The bezel is unidirectional and features a black ceramic insert that is extremely scratch-resistant. • Bracelet: It comes mounted on a sturdy stainless steel bracelet with a satin-matte finish, equipped with a deployant clasp (butterfly clasp) with dual safety buttons • Exclusivity: Each piece is engraved on the case back with its individual serial number in the form of “One of 500.” • The manufacturer’s suggested retail price (MSRP) was approximately 1,790 EUR / 1,890 CHF.