Oris Aquis Date Calibre 400 Blue 43.5mm

In-Depth Review

When Oris introduced the Calibre 400 in 2022, the independent Swiss manufacture signaled serious intent to compete on equal footing with established players in the mid-range dive watch market. The Aquis Date 43.5mm in blue exemplifies this commitment, pairing the brand's proprietary in-house movement with a refined design that respects dive watch fundamentals without unnecessary embellishment. The 120-hour power reserve—double that of many competitors—distinguishes the 400 caliber as a practical advantage for working professionals and weekend warriors alike. The ceramic bezel, sapphire crystal, and 300-meter water resistance comprise the expected toolkit for this category, while the generous 43.5mm case diameter and 14mm thickness position it as a substantial but wearable instrument watch. The brushed stainless steel bracelet and clean blue dial maintain aesthetic restraint, avoiding the overcomplicated designs that plague contemporary dive watches.

This watch targets discerning buyers seeking substance over trend. Collectors prioritize in-house movements and independent manufacturers; dive watch purists appreciate the straightforward 60-click bezel and readable dial. The extended power reserve appeals to those who wear watches intermittently rather than daily, a practical consideration often overlooked in marketing materials. Weekend divers and travel-focused professionals represent the core audience.

At roughly $2,700 on the secondary market, the Aquis competes directly with Tudor's Black Bay Fifty-Eight and Seiko's Prospex line. Tudor offers storied heritage and proven movements; Seiko delivers superior value and proven reliability. Oris occupies middle ground—independent watchmaking credibility without established brand heritage, paired with genuinely innovative movement engineering. For buyers valuing technical substance and Swiss manufacturing at this price point, that proposition proves compelling.