Aquis Calibre 400

The Oris Aquis Calibre 400 marks a major leap for Oris, introducing their in-house Calibre 400 automatic movement—a point of pride for the brand and a key reason collectors seek out this reference. Designed as a modern diver, the Aquis 400 blends tool-watch practicality with a refined, contemporary aesthetic, making it a standout in the Aquis lineup. Its five-day power reserve and strong anti-magnetic resistance set it apart from earlier Aquis models, reflecting Oris’s push toward technical independence and reliability.

This 43.5mm stainless steel diver is water-resistant to 300 meters and features a ceramic bezel, date at six o’clock, and a choice of dial colors. The Calibre 400 movement is visible through the display caseback, a feature not found on all Aquis variants. Key reference numbers include the standard Aquis Date and the Aquis Calibre 400 series—make sure you’re looking at the 400, as earlier Aquis models use Sellita or ETA-based movements with shorter power reserves and less advanced anti-magnetism.

Prices vary depending on dial color, bracelet or rubber strap configuration, and whether the watch is new or pre-owned. The Calibre 400 commands a premium over standard Aquis models due to its movement and extended warranty. When shopping, confirm the movement through the display back and ensure the warranty card matches the serial and reference, as Oris’s 10-year warranty is a major value driver for this model.