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It depends on to my experience . I have bought several Seiko modded watches with the NH35 Seiko Movement (to many it's just an average movement ) but it runs within COSC and is just as accurate as ETA 2836 movement watches if not better .
However, same NH35 movement in a different manufacturer can run as fast as 4 minutes per week or in a different manufacturer slow 1 minute per week
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