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@Regal
5 minutes is well outside of normal tolerances, even for a 7S.
Seiko 7S/4R/6R movements are generally capable of being very accurate, they just don’t regulate them out of the factory so it’s pot luck what you get. My JDM turtle is as accurate as my Rolex, if not more. The turtle I bought @inchpincher gains 15 seconds a day or something. 🙄
A friend of mine regulated his Seiko 5 himself to +0.5 sec/day.