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It’s basically the same as the 6R but without the anti-magnetic hairspring (Spron I think). Accuracy is pot luck I’m afraid. I have some that are within a few seconds a day. But you will always have a chance of getting one that runs +30. FWIW, I’ve never had one that runs worse than about 8 seconds out. But I think I’ve been lucky.
You kind of have to accept it as part of the watch. Or if it turns up running terribly, sell it / send it back.
How is the seiko 4R36 movement? I had the spb143 but let it go because the accuracy upset me. I am considering the snoopy diver as a daily.