Is your watch experiencing time keeping problems, do you know for a fac that some parts will need replacement ? Or did you just want a service as a matter of principle?
For a watch like this one, there’s no need to go to someone who specializes in «vintage Longines ». I’ve never even heard of such a person except perhaps I would think some watchmakers in Italy.
The 27M is a workhorse movement with plenty of donors floating around, your watch looks to be in good condition, a good independent watchmaker should be able to sort it out.
as for Longines’ service,
Longines has set up a workshop of 10 vintage watchmakers as part of their historical department to service and restore watches while retaining their originality. I never sent them a watch for service but I know a number of people who have and they provide very individualized service. Also I’ve met and interacted with the watchmakers on several occasions.
They’d never restore a dial unless requested and they would never polish a case against a client’s stated intent. They are in regular contact with collectors and know exactly what’s needed. However that service comes at a price.
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