Running chronograph indefinitely on Speedmaster?

Amir · Dec 26, 2021

Hi, I own a 2021 Speedy moonphase and wondering what impact running the chrono indefinitely has on service and accuracy (and to lesser extent power reserve) . Does anyone have verified knowledge of this?
Thanks!
(why? I'm just drawn to the movement of all hands )

JimInOz · Dec 26, 2021

It's your watch so if you like to see all of the hands going then do it.
It won't harm the watch.

Foo2rama · Dec 26, 2021

It will have a minor hit on length of running. But if you turn off the chrono it will resume. Ie it’s a torque issue not a power reserve issue. The chrono takes no extra power to run but as the mainspring winds down it provides less torque and the chrono requires more torque in the system.

you will get a little bit of additional wear in the chrono system of the watch but nothing to worry about.

Running chronograph indefinitely on Speedmaster?

Amir

JimInOz

Foo2rama

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