[defrost]

Mechanical clocks (like all clocks . . .) drift.

For two centuries mechanical clocks and watches have been regularly wound and reset.

Ports traditionally had a noon day canon and ball drop down a pole (like a flag pole) for ships in the harbour to set their onboard clocks to (for navigational use in determining Longitude).

Watches frequently have bimetallic strips (two sided) with metals that each expand with a differing coefficient to counter effect for rate of 'tick' with respect to tempreture.

Ships at sea required triplets of clocks with mechanisms that countered for pitch and roll accumulation.

You might enjoy:

https://ciechanow.ski/mechanical-watch/

https://en.wikipedia.org/wiki/Longitude_(book)

https://en.wikipedia.org/wiki/Horology