Paradoxical rate increase over mainspring power reserve decrease; coaxial double barrel movement

Deafboy · Aug 7, 2020

M'Bob
Interesting.

Note in that paragraph I was talking about escapement error (as per your question). A real watch has escapement error and other factors (e.g. hairspring design) that determine rate.

Swedesign · Feb 10, 2021

Here is another factor that may have an impact on the amplitude but in this case also seems to stabilize and reduce the beat error. I have just made a service of a Rolex 3135 and installed a new mainspring. I was happy with the rate and amplitude but thought I have to adjust the hairspring a little to get a better beat error value. My first check in the timegrapher was before the automatic part/rotor was installed and gave the following values. Amplitude above 261 and beat error 0,7 MS. Then intalling the automatic part/rotor and the following values occure. Amplitude up to 260 and beat error 0,4 MS. As said before...many small things will have a huge impact.