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· Premium Member
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minidriver said:
4r15 and 4r16 are better finished movements all around and they use Spron 510 mainspring that extends the power reserve to 50+ hours.
Not all around, only in the rotor and the part of the back plate visible through a display back. the rest is still stamped and unfinished, and AFAIK, for the most part stock 7s. I'll give you the mainspring material though.
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