Oris Aquis Date Calibre 400 Green

About This Watch

The Oris Aquis Date Calibre 400 Green represents the ultimate evolution of the Aquis collection, combining the popular 41.5mm green-dial format with Oris's groundbreaking in-house Calibre 400. This movement is the most significant development in Oris's modern history — a fully in-house automatic with 120 hours (five full days) of power reserve, anti-magnetic properties via a silicon escapement, and Oris's unprecedented 10-year warranty with a 10-year recommended service interval. These specifications are genuinely remarkable for a watch at this price point and challenge the notion that in-house calibers are exclusive to watches costing $5,000 and above. The Calibre 400 was developed over seven years in Hölstein and represents Oris's declaration of independence from third-party movement suppliers — a statement that resonated powerfully with the watch enthusiast community. The green sunburst dial paired with the matching green ceramic bezel creates the same striking visual identity as the standard Aquis green, but the Calibre 400 version adds a red rotor visible through the exhibition caseback, a signature design element that immediately identifies it as the upgraded model. The five-day power reserve means weekend warriors can take the watch off Friday evening and find it still running Monday morning — a practical advantage that transforms daily use. At $3,200, the Calibre 400 version commands a premium over the standard Aquis, but the in-house movement, extended warranty, and longer service intervals arguably make it more cost-effective over a decade of ownership.