Dissecting a rolex dial

A 1950's Rolex Oyster Perpetual - Officially Certified Chronometer. So what does the really mean?

Oyster - The name based on it's case design. The "Oyster" name originated as a model in 1926 based on the patents that featured a screwdown back, bezel and crown. This means that the parts weren't clicked on like a lid but had threads to screw and be more waterproof.

Perpertual - This word refers to "the ability of the watch to run on the energy provided by the motion of the wearer's wrist rather than manual winding". More commonly named in the watch world as an "Automatic". This was first used in 1931.

Officially Certified Chronometer - A chronometer watch refers to the independent third party testing of the movement. When a movement is produced it is shipped to an independent testing facility that puts the movement through rigorous tests and when it still works within it's allowed margins the watch can have it's dial stamped with proof of it's testing.

Let me know what other questions on Rolex, dials or other aspects on watches you have!