Oris Carl Brashear Cal. 410 Ltd. Edition Bronze 0552/2000 Full-Set

5-Day Reserve!  For many reasons, you may not wear a mechanical watch every day. If you put a standard mechanical watch down for a day or two, it will stop as the power reserve runs down. Cal. 401 has a five-day power reserve, so it’s ready to go when you are. It delivers this longer period of use via twin barrels, both of which house an extended mainspring, each long enough to store two-and-a-half days of power. It’s highly accurate, to -3/+5 seconds a day, better than a chronometer.

Anti-magnetism
Most Swiss watch movements will be magnetized if exposed to the strong magnetic forces we encounter daily. When this happens, they become less accurate and can stop altogether. To make them highly anti-magnetic, Oris engineered movements in the Cal. 400 Series using more than thirty non-ferrous and anti-magnetic components, including a silicon escape wheel and a silicon anchor. In testing by the renowned Laboratoire Dubois, Calibre 401 deviated by less than 10 seconds a day after exposure to 2,250 gauss.