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.
In-Depth Review
# Oris Aquis Date Calibre 400 Green Editorial
The 2021 introduction of Oris's proprietary Calibre 400 movement fundamentally shifted expectations for what a mid-range sports watch should deliver. Housed within the familiar 41.5mm Aquis case, this in-house automatic caliber offers a remarkable 120-hour power reserve—double that of most competitors—while maintaining the 28,800 vph frequency that ensures chronometric stability. The green dial variants have become the collection's visual centerpiece, balancing legibility with contemporary aesthetics that avoid the ubiquitous blue found elsewhere in the segment. Paired with a ceramic bezel, sapphire crystal, and robust stainless steel construction, the Aquis Date remains fundamentally a tool watch with legitimate 300-meter water resistance and genuine manufacturing integrity backing its specification sheet.
The Aquis Date appeals primarily to working divers, desk professionals who appreciate mechanical horology, and collectors seeking reliable Swiss sports watches without premium pricing. This watch functions equally well on a weekend expedition or worn daily under a business shirt. The date window integrates logically at three o'clock, and the 13.2mm thickness ensures comfortable wrist presence without excessive bulk. The 120-hour reserve proves especially practical for those who don't rotate watches frequently.
At current market pricing around $2,700, the Aquis Date occupies challenging territory against the Submariner-inspired Longines HydroConquest and the thoroughly modern Tissot PRX Diver. Both offer compelling arguments, but neither matches Oris's in-house movement pedigree or the practical advantage of five-day power reserve. For buyers prioritizing genuine manufacture and honest engineering over brand prestige, this watch represents substantive value.
Specifications
Movement
| Movement Type | Automatic |
|---|---|
| Caliber | Oris Calibre 400 |
| Power Reserve | 120 hours |
| Frequency | 28,800 vph |
| Jewels | 30 |
Case
| Case Diameter | 41.5mm |
|---|---|
| Case Thickness | 13.2mm |
| Case Material | Stainless Steel |
| Crystal | Sapphire |
| Bezel | Unidirectional rotating, ceramic insert |
| Dial Color | Green |
| Lug Width | 21mm |
| Lug-to-Lug | 49.0mm |
Features
| Water Resistance | 300m / 984ft |
|---|---|
| Bracelet/Strap | Stainless steel bracelet |
| Clasp | Folding clasp with safety push-buttons |
| Weight | 178g |
| Complications |