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A chronograph has a chronograph or detent escapement. The purpose of which is eliminate the sliding friction in the escapement and variability caused by viscosity change in lubrication with temperature.

I never heard that a stopwatch makes a watch a chronometer. That sounds like a marketing gimmick.

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Ahould your original post read “chronometer” instead of chronograph? I also understand chronograph to mean a stopwatch complication, which is different from a chronometer certification.

Doh yeah. It's too late.

Even chronometer just means it passes chronometer specification, which for Swiss watches means that the movement is certified by COSC.

It does not imply a particular kind of escapement.

I have a Certina with ETA 2824-II and a Longines with ETA 2892-A2 which are inside COSC specs but not certified as chronometers.

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