Condition of the movement is key. Many parts for this caliber are discontinued, and rarely do I service one where parts are not needed. So it really depends on what the watchmaker did or didn't do that will determine how well the watch will run. Did they replace the parts that were worn? If the worn part was not available new did they do something else to repair it, such as polish pivots, repivot the wheel, etc.? Or was this just a "clean, lube, and regulate in one position" type of service (which is not a proper service in my view)? Not all watchmakers do the same things in the course of a service.
Note that if he sent you a photo of the watch in one position on a timing machine and showing a rate on the screen like I see all the time as "proof" of how well the job was done, realize that without amplitude and timing in all positions, that one photo won't tell you much. It's very possible that it ran -3 in the position shown and still does, but it could also have positional variation that is causing large gains when the watch is in other positions. So nothing may have "happened" to it in transit, and there's certainly no indication that the balance spring needs cleaning.
We aren't going to be able to diagnose this remotely, so the watch needs to be looked at by someone you trust to get a full picture of the problem and what is required to fix it.
Cheers, Al
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