1925 Gruen Adjustment screw purpose?

Thread: 1925 Gruen Adjustment screw purpose?

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  1. #1
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    1925 Gruen Adjustment screw purpose?

    Have several Gruen pocket watches. 2 with best Verithin movements have
    small adjustment screw near winding wheel. I have not noticed on others anywhere. On this one mainspring letdown is retarded not freely unwinding,
    so wonder if it is adjustable drag on the winding mechanism?
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    Last edited by artb; February 5th, 2010 at 07:07.

  2. #2
    Member AbslomRob's Avatar
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    Re: 1925 Gruen Adjustment screw purpose?

    What's the little hole on the bottom plate? It looks like there's somethign on the other side that pokes through. Very curious...
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    Re: 1925 Gruen Adjustment screw purpose?

    Showed this to a real expert on old watches who has helped me become a Gruen appreciator and I was surprised he did not want to guess its function. This is not a frivolous question to me since I want to become modestly expert with Gruens and experts do not know about it. Probably
    something simple and unnecessary.

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    Re: 1925 Gruen Adjustment screw purpose?

    Hi -

    Without having the watch in front of me, I'd venture the speculation that it is a reverse-threaded screw to ensure the proper fitting of that particular bridge. In the third picture, there is an arrow pointing counter-clockwise directly above that same screw in the first picture, and for me that's the give-away.

    Like I said, without the movement in front of me (and permission to play with it... ) I can't tell for sure...

    What's interesting as well is the small screw right above the winding wheel in the first picture with the very broad slot. I've seen that used to indicate a reverse-threaded screw as well (also three parallel slots).

    JohnF
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    Re: 1925 Gruen Adjustment screw purpose?

    The odd wide slot screw is stem screw not on older Verithins. These 3 movements indicate how Gruen movements with same name had differences.

  7. #6
    Member Erik_H's Avatar
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    Re: 1925 Gruen Adjustment screw purpose?

    The small adjustment screw is also on my VeriThin movement:



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    Re: 1925 Gruen Adjustment screw purpose?

    Erik: A nice older (1925?) better quality movement. I get the impression that Gruens sold more based on their fancy cases and dials than movement
    quality. So the better older movements such as this may commonly have the odd screw which is not in the newer movements and more popular common cheaper ones. Their Precision marking originally was for the better adjusted ones, later seemed to be on nearly everything including ordinary wristwatches. Later production for company survival reasons was less about quality and more about merchandizing. The elusive screw might be considered a quality indicator?
    Last edited by artb; February 5th, 2010 at 17:35. Reason: add question

  9. #8
    Member Erik_H's Avatar
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    Re: 1925 Gruen Adjustment screw purpose?

    I am only a Gruen novice, but my movement is not marked Precision it is a V4 movement adjusted to 5 positions so it is not of the highest range.
    Erik_H
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    Member sherwoodschwartz's Avatar
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    Re: 1925 Gruen Adjustment screw purpose?

    might it be for the detent?

  11. #10
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    Re: 1925 Gruen Adjustment screw purpose?

    Quote Originally Posted by Erik_H View Post
    I am only a Gruen novice, but my movement is not marked Precision it is a V4 movement adjusted to 5 positions so it is not of the highest range.

    True but it is a better quality of the Gruen models. The one I show I think is same age and not marked precision as well with 19J, 6 position adjt. Its number 518000+. Not sure when Precision marking as a grade quality indicator started. Here is a UV precision not position adjusted, from before 1929. The first Verithin of 1904 was marked precision as part of its description. Also here a later cheaper model marked precision.
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    Last edited by artb; February 6th, 2010 at 13:42.

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