Sellita Winding Issue
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  1. #1
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    Sellita Winding Issue

    I have a Sinn 104 with a Sellita movement. I love the watch. It keeps excellent time, typically near perfect on my wrist and gaining 2-3 seconds overnight when left dial up. I read that habitual hand winding of many automatic movements can damage parts of the winding system over time. So I have got in the routine of simply holding the watch and rotating my wrist back and forth for a minute or so to move the rotor in both directions and wind up the mainspring before strapping on the watch. Oddly, in the short time it takes to do this, the watch will gain about 5 seconds. Then it will settle down to near perfect accuracy (but now at +5) when I stop winding it in this manner. Seems strange to gain a full 5 seconds in such a short time. Anybody have an explanation for this?
    Last edited by dhtjr; October 17th, 2014 at 18:14.

  2. #2
    Member Kurt Koerfgen's Avatar
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    Re: Sellita Winding Issue

    While I don't have anything better than a guess (the hand movement you describe affects the movement amplitude) this behavior is quite common with automatic watches.

    If you are moderately active it should not be necessary (although I do it sometimes myself for the sake of feeling the rotor move around), and the dangers of winding an automatic are overstated - it just should not be necessary.




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    Re: Sellita Winding Issue

    [QUOTE=Kurt Koerfgen;8868090]While I don't have anything better than a guess (the hand movement you describe affects the movement amplitude) this behavior is quite common with automatic watches.

    If you are moderately active it should not be necessary (although I do it sometimes myself for the sake of feeling the rotor move around), and the dangers of winding an automatic are overstated - it just should not be necessary.


    Thanks for the reply. Yes, I figured it might have something to with amplitude. And I'm probably being a bit paranoid about avoiding crown winding.

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    Re: Sellita Winding Issue

    Quote Originally Posted by Kurt Koerfgen View Post
    ...and the dangers of winding an automatic are overstated...
    Boy are they ever. It's turned into one of the great myths of WISdom... repeat an opinion often enough and people start thinking it's fact.
    Last edited by BrentYYC; October 24th, 2014 at 22:48.

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    Re: Sellita Winding Issue

    Quote Originally Posted by BrentYYC View Post
    Boy are they ever. It's turned into one of the great myths of WISdom... repeat an opinion often enough and people start thinking it's fact.
    With certain movements, it's clearly not a myth. Some movements, most notably the ETA 2824, 2836, and their Sellita copies (SW200 and SW220), are prone to wear on the barrel bridge from excess manual winding...

    I have seen it and repaired it many times - it's a fact not a myth.



    As the 104 uses the SW220 (copy of the 2836) I would certainly avoid hand winding it in an excessive manner.

    Cheers, Al
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  7. #6
    MJM
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    Re: Sellita Winding Issue

    It's an auto full of dials and springs. Any movement in any direction at any speed will affect it in some form or fashion. You want accuracy, buy a Timex. Sad, but true. I've seen some watches gain 10 sec right after winding and then settle down over a 15 minute period back to slight gains.
    Without time there is nothing......


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