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The CW Colchester I have has a Sellita SW200 COSC Automatic. It keeps impecable time. To the point that I just checked and it's bang on, and I last adjusted the time when the clocks changed march 27th.
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Coming back to this after 24 days and the CSOC sw200 is only 4 seconds slow. Maybe it's oscillated in this time period I don't know.
skinny
@Sumo
Every common micro brand will do an SW200 or equivalent for somewhere between £800 and £2k depending on the case and finishing. A well tuned version should keep time pretty well, a straight from the factory version could be +-2 mins a week similar to a seiko 5. Sinn are at the top end of the price scale but they're more established and more reliable than a random micro brand. I put them in the same bucket as Doxa.