Oris Watch Aquis Date Cal 400. 01 400 7763 4135-07 4 24 74EB The beneficiary of the latest in-house Oris Calibre 400 movement, this robust and powerful Oris Aquis watch boasts an impressive lists of benefits including a five-day power reserve, anti-magnetic components, and an impressive 10 year warranty. Its self-sufficiency is mastered by a pair of mainspring barrels delivering a power reserve of 120 hours, a low-friction slide bearing system and a silicon anchor and escape wheel which are completely lubrication free. The Oris Calibre 400 movement also promises an accuracy of 3 to +5 seconds a day and a frequency of 28,800 vibrations per hour. Aside from the addition of the in-house movement, the Oris Aquis Date Calibre 400 watch retains the familiar aesthetic of the Aquis collection including a 43.5mm stainless steel case and a water resistant rating of 300 metres. The unidirectional rotating bezel delivers optimal functionality for measuring elapsed dive times with a 60 minute scale decorating the blue ceramic inlay while the sporty black rubber strap easily fits over a dive suit thanks to the folding buckle with extension. The ocean-inspired blue dial is decorated with noticeable Superluminova coated hands for hours and minutes, a sleek seconds hand and a date window at 6 o’clock. The functions on the Oris Aquis Calibre 400 watch are protected by sapphire crystal with anti-reflective treatment paired with a screw in crown and screw down case back.