That's a Speedmaster reduced, so a modular chronograph movement. Did he service the entire movement including the module, or just the base movement?
Getting the base movement running well should not be a problem, as it's based on the Cal. 1120, which is in turn based on the ETA 2892, so a very common movement to work on. It's usually the chronograph module stuck on top that is going to cause problems if anything is. I'm assuming these measurements on the timing are being done with the chronograph not running. If so then I would demand a refund and find another watchmaker - note that many won't work on this movement so you may need to send it to Omega, and they will likely swap the movement for a refurbished one as that is common with these watches.
Cheers, Al
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