Like all Rolex watches, the Oyster Perpetual 41 boasts Superlative Chronometer certification. This exclusive title attests to the timepiece’s outstanding performance on the wrist. This in-house certification is rigorously checked by independent and internationally recognised Swiss bodies.
Since 2026, Superlative Chronometer certification has been supplemented with three new evaluation criteria: resistance to magnetic fields, reliability, and durability, monitored throughout all phases of design and production of each individual watch. These involve hundreds of checks and validations that directly contribute to the timepiece's performance. The new criteria join those established during the redefinition of the certification in 2015, namely precision, waterproofness, self-winding, and power reserve. It was in that year that Rolex set up an exclusive protocol of tests concerning the finished watch, conducted within the manufacture on fully automated systems. Evaluated after the movement has been cased, the criteria concerning precision are particularly high. This must be within a deviation of –2 and +2 seconds per day. The rate deviation tolerated by the Brand for a finished watch is far lower than that permitted for the official certification of the movement alone.
The Superlative Chronometer status is symbolised by the green seal that accompanies every Rolex watch along with a five-year international guarantee.