Oris Slims Down ProPilot Calibre 111 With 10-Day Power Reserve

Oris has trimmed down its ProPilot Calibre 111, shrinking the case from 44mm to 43mm and shaving 0.65mm off the thickness, landing at 13.2mm. The redesign arrives with two new dial finishes—black and pine green—both finished with a textured, almost pebbled surface that catches light differently as you move your wrist. The watch still runs on the same hand-wound Calibre 111 movement, a proprietary engine that can power the watch for a full ten days, or 240 hours, on a single wind.

The story of this ten-day power reserve reaches back more than a decade. In the early 2010s, Oris introduced the Calibre 110, its first new proprietary movement in 35 years. The breakthrough was architectural: instead of relying on multiple mainspring barrels stacked together, Oris engineered a single barrel that could hold an unusually long mainspring—1.8 metres when fully extended. By coiling that impossibly long strip of metal into one circular container, the movement gained enough stored energy to run for ten days without winding. A year later, Oris added a date display and called it the Calibre 111, the same movement still ticking inside this new version.

The mechanics are straightforward but elegant. When you wind the crown, you're tightening that coiled mainspring, storing energy that gradually releases to drive the watch's gears. The longer the spring and the more tightly it's coiled, the more energy it holds. At 1.8 metres, Oris pushed the limits of what a single barrel could contain. The movement oscillates at 21,600 vibrations per hour—the balance wheel swinging back and forth three times every second—with the escapement producing six beats per second. That steady rhythm regulates how quickly the mainspring's energy bleeds away, keeping the watch accurate.

Because the Calibre 111 is manually wound, there's no automatic rotor spinning as you move your wrist. You wind it yourself, but the ten-day reserve means the watch will comfortably survive several days sitting unwound on a shelf. To help you track what's left, Oris fitted a non-linear power-reserve indicator at 3 o'clock. Rather than spacing the day markings evenly around the dial, Oris bunches them together when the watch is fully wound and spreads them further apart as the spring runs down. The closer you get to empty, the more spread out the markings become, giving you a clearer picture of how much time remains before you need to reach for the crown again.

The dial redesign moves the date window from its old position beside the small seconds subdial to 6 o'clock, a small shift that tidies up the overall composition. The power-reserve gauge at 3 o'clock and the small seconds at 9 o'clock now have more breathing room. The vertically brushed centre of the dial flows into a grainy texture that extends across both subdials, giving the watch a more cohesive appearance. Both black and pine green versions use applied luminous numerals and hands, and both sit behind a domed sapphire crystal. The caseback is also sapphire, letting you peer through at the movement inside. Water resistance sits at 100 metres, enough for everyday wear and brief immersion but not for diving.

The watch arrives in Australia this October priced at AUD $10,400 on a dark brown Cordovan leather strap or AUD $10,700 on a stainless steel bracelet with an Oris folding LIFT clasp. The case measures 43mm across with a 51mm lug-to-lug distance, still a substantial watch but slightly more wearable than its predecessor. Oris includes a five-year warranty after registering through MyOris. The redesign doesn't represent a massive overhaul—the jet-engine-inspired fluted bezel and oversized crown remain, as they should on a pilot's watch—but the slimmer proportions, more considered dial layout, and the wonderfully impractical engineering of a ten-day mainspring add up to a watch that feels both refined and purposeful.