Longines 431 movement - manual winding - how many turns of the crown?

Thread: Longines 431 movement - manual winding - how many turns of the crown?

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    Longines 431 movement - manual winding - how many turns of the crown?

    Longines 431 from 1968/69.
    33600 vph ultrachron

    I know it's an automatic but I want to get a sense of how worn my mainspring is.
    I have hand wound it before (maybe 10-15 turns?). I *think* it started getting a little tight but it could just be me not wanting to break anything.

    Maybe I should just buy a winder. Thoughts?

    Follow-up question: When fully wound, how much reserve power did the 431 movement have new?
    Last edited by alceryes; June 17th, 2019 at 03:03.

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