Rolex caliber 3230

Rolex's latest workhouse movement was introduced in 2020 and is a no-date version of the caliber 3235 Paramagnetic nickel-phosphorous pallet fork and escape wheel In order to increase the power reserve, Rolex engineered caliber 3230 and 3235 to utilize the Chronergy escapement, patented by Rolex, which combines high energy efficiency and dependability.

Made of nickel-phosphorus, it's also insensitive to magnetic fields The movements are fitted with an optimized blue Parachrom hairspring, manufactured by Rolex in an exclusive paramagnetic alloy that makes it up to 10 times more shock resistant than traditional hairsprings which helps to maintain precision Each movement is tested to Superlative chronometer standards adjusted to a rate of -2/+2 per day, after being cased up, which is over two times more precise than a standard COSC chronometer. Source