This Oris Aquis Chronograph continues the legacy of the Aquis Date divers collection with some updates, including a lighter case and bezel profile
Oris caliber 771 (base Sellita caliber SW510 a) | Automatic | Diameter: 30 mm (13¼ lignes) | Thickness: 7.9 mm | Frequency: 28,800 vph (4 Hz) | Jewels: 27 | Stop-second device, quick date setting | Hours, minutes, small seconds, chronograph | Power reserve: 48 hours
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Oris caliber 771-1 (base Sellita caliber SW510 a) | Automatic | Diameter: 30 mm (13¼ lignes) | Thickness: 7.9 mm | Frequency: 28,800 vph (4 Hz) | Jewels: 27 | Stop-second device, quick date setting | Hours, minutes, small seconds, chronograph | Power reserve: 62 hours
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It looks like there are two versions of the caliber 771. The possible first generation with a power reserve of 48 hours, according to the specs Oris delivered. And we find a caliber 771-1 in the latest generation of their chronographs. Now with a 62-hour power reserve.
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Looking at the size and specifications, both are most likely based on the Sellita caliber SW510 a, which is a three-register chronograph with a date between 4 and 5. The Oris caliber has the date at the 6 o’clock position.
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Watches with the Oris caliber 771
Oris is expanding their Diver’s series with this Oris Diver Sixty-Five Chronograph 40 mm, a new case size for the Sixty-Five diver