What does “Cyclops” mean?

The cyclops is the small magnifying lens on the crystal above the date window, making the date easier to read. Rolex introduced it in the early 1950s, and it is now a recognisable feature of the Datejust, Submariner Date, GMT-Master II and many other Rolex models. The Rolex cyclops magnifies the date about two and a half times.

Dealers check the cyclops for alignment over the date, clarity and strength of magnification, since a poorly fitted or weak cyclops is a classic sign of a counterfeit or a non-original crystal. Some buyers dislike the look of the cyclops, and some models, such as the no-date Submariner, don't have one at all. Cracks, chips or a cyclops that is starting to lift are reasons to replace the crystal at the next service, and a replacement from the brand is a normal service part.

Example: 'Cyclops clear and well aligned, crystal original.'