Superlative Chronometer
certification
The Oyster Perpetual Datejust 41 is covered by the Superlative Chronometer certification. This exclusive
designation is issued to each watch leaving the Rolex workshops, attesting to its excellent performance on
the wrist. This in-house certification is strictly controlled by internationally recognized, independent
Swiss entities.
In 2026, the Superlative Chronometer certification has been strengthened with the addition of three new
testing criteria: resistance to magnetism, reliability and sustainability. These criteria are implemented
throughout the design and manufacturing stages of each timepiece – hundreds of checks and validations
directly related to the watch’s performance are carried out during these phases. They supplement the
criteria established when the certification was redefined in 2015 governing precision, waterproofness,
self-winding and power reserve. That year, Rolex set up an exclusive testing protocol for its finished
watches, conducted inside the manufacture on fully automated equipment. The precision requirements are
particularly stringent: measured after casing the movement, the watch’s accuracy must be between –2 and +2
seconds per day. The rate deviation tolerated by the brand for the precision of a finished watch is
significantly smaller than that accepted for official certification of the movement alone.
The Superlative Chronometer status is symbolized by the green seal that comes with every Rolex watch and is
coupled with an international five-year guarantee.
