My watches have kept time at different rates after each service.
If a watch consistently gains or loses then I see it as a simple matter of regulation, and most watchmakers specializing in a particular brand should have no difficulty regulating a watch and having it back to you in a week.
I haven't had a manual watch with a clutch, to my knowledge, and so with experience I have learned the number of "winds" it takes to keep a given watch running reliably.
I wind my grandfather's 1940 Hamilton 992B 21 times, right when I wake up, and it gains exactly 4 seconds a day, every day, without fail.
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