von jafanshen » 14. Dezember 2017, 09:55
Most all developments made to the 3255, we learned, were refinements both when it came to movement architecture as well as materials used – and these refinements did go a long way. The 3255 now has 70 hours power reserve – about 50% more than its predecessor – mainly achieved by a new escapement design as well as a new mainspring barrel whose walls are half as thick as before, allowing for the fitting of a larger mainspring – this latter development alone provides about 10 extra hours of power reserve. The other highly notable innovation is the "Chronergy" escapement, which is said to be much more efficient than its predecessor. The power reserve is extended by almost 50%, which, according to Rolex, is thanks to the efficiency of the escapement.