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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.
skinny-
That's really good. CW are constantly tempting for me. They don't outright say they're tuning the movements but they're at least engraving the rotor so I'd expect they test them before putting them in the case. It's something that annoys me about Seikos generally, they always seem to run inconsistently, some weeks slower than others but always noticeable.
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.