SOT: Seiko 9F prototypes

Thread: SOT: Seiko 9F prototypes

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    Re: SOT: Seiko 9F prototypes

    Hmm, I think that article is mistaken. What they show are prototypes of the Spring Drive concept. I've always found it interesting (and fitting) that the 1st prototype from 1982 that they show is clearly a modified mechanical caliber 6309.

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