Omega Seamaster Aqua Terra 150M Master Co-Axial Chronometer Original Box & Papers!

Omega Seamaster Aqua Terra 150M watch

The Aqua Terra has always been Omega's answer to the question nobody quite asks out loud — what if you need a watch that works with a suit, on a sailboat, and through an MRI? The Caliber 8500 at the heart of this ref is Omega's first fully in-house Co-Axial movement, purpose-built from the ground up with 202 components designed to exploit the Co-Axial escapement's full potential. Twin barrels with DLC-coated mainsprings deliver a 60-hour power reserve, a silicon Si14 balance spring shrugs off magnetic fields greater than 15,000 gauss without needing a Faraday cage, and the whole thing is COSC chronometer certified. Because there's no soft-iron shielding required, Omega gives you a transparent caseback — so you actually get to see the arabesque Geneva waves on one of the best-finished movements in its price class.

What separates this particular reference from the rest of the Aqua Terra lineup is the way it splits the difference between dressy and deliberate. The sun-brushed black dial carries the signature Teak Concept pattern — horizontal lines inspired by the wooden decks of racing yachts — and the orange varnished seconds hand paired with the orange minute track gives it just enough edge to keep it from reading as a boardroom-only piece. On the brown leather strap with beige stitching, it wears like something designed for a weekend in Monaco, not just Monday morning. At 41.5mm with a lug-to-lug under 49mm and only 13mm thick, it sits flat, disappears under a cuff, and punches well above its weight as a daily wearer. This is the Aqua Terra for people who want one watch that actually does everything.

KEY DETAILS

• Name: Omega Seamaster Aqua Terra 150M Master Co-Axial Chronometer
• Reference: 231.12.42.21.01.002
• Case Material: Stainless Steel (brushed and polished)
• Case Diameter: 41.5mm
• Case Thickness: ~13mm
• Lug-to-Lug: 48.5mm
• Lug Width: 20mm
• Bezel: Fixed, stainless steel
• Crystal: Domed scratch-resistant sapphire with anti-reflective treatment on both sides
• Caseback: Transparent exhibition
• Dial: Sun-brushed and lacquered black with Teak Concept horizontal line pattern, orange varnished seconds hand, orange minute track, date window at 3 o'clock
• Lume: SuperLuminova (hands and indices)
• Movement: Omega Caliber 8500 (in-house, automatic, Co-Axial escapement, Master Co-Axial designation)
• Jewels: 39
• Frequency: 25,200 vph (3.5 Hz)
• Power Reserve: Approx. 60 hours
• Precision: COSC Chronometer certified
• Magnetic Resistance: Greater than 15,000 gauss (1.5 tesla)
• Functions: Hours, minutes, seconds, date (at 3 o'clock)
• Water Resistance: 150 meters / 500 feet
• Strap: Brown leather with beige stitching and stainless steel deployment clasp
• Crown: Screw-down
• Special Features: Silicon Si14 balance spring, twin barrels with DLC-coated mainsprings, automatic winding in both directions, no soft-iron inner case required for magnetic protection