You would need to provide VERY strict instructions about what you want done and be very clear about anything that you DON'T want done. I have sent 2 watches that were sent through to LVMH in Switzerland, for work that could not be done in Canada and one was great and the other had an issue that I paid my local watchmaker to fix. It was relatively minor, albeit irritating, but it was easier than sending it away again.
There are 2 independent watchmakers in my vicinity who are very good with Zenith chronographs. I have the same dilemma right now with an El Primero Rainbow from 1993. The crown threads are quite worn and my watchmakers can easily service the movement but they cannot get a replacement tube and crown. I could probably get by, if I am super careful and don’t over tighten the crown but it only engages the threads for 3/4 of a turn.
If yours has no issues and just needs a service, a good independent watchmaker would be the best way to go.
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