Pierce Chronographs

Thread: Pierce Chronographs

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  1. #1
    Member trim's Avatar
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    Pierce Chronographs

    Hi All,

    What is the significance of Pierce chronograph backs - is there any? Does it give any indication of the age of the watch or reveal anything else?

    I have seen press fit, I think I saw mention of a 4 screw back. The one I have just bought has an 8 screw back and is marked waterproof on the dial. Mine seems to have a pretty low case#

    I have searched a fair bit, not found much, a couple of threads here, nothing on NAWCC, nothing much on MWR - so any info you can point me to would be great. To be honest I would have thought there would be more online resources for Pierce chronographs given their apparent popularity with collectors. Perhaps I just missed it.

    Does anyone have any catalogues or other info?
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    Last edited by trim; May 19th, 2010 at 07:55.

  2. #2
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    Re: Pierce Chronographs

    As a collector of a few old chronographs I had one with same back. It was not expensive and sold profitably after learning it had some kind of odd clutch arrangement in chronograph mechanism that was subject to wear. Mine was fine, however. It was the waterproof version as is yours. Its odd movement I guess makes it interesting to collectors.
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    Last edited by artb; May 22nd, 2010 at 09:20.

  3. #3
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    Re: Pierce Chronographs

    Pierce were the inventors of the vertical clutch that is becoming standard on most modern chronograph movements. The wear is not really greater than in horizontal clutches (or even swivel pinions) but Pierce used slightly low grade materials (including some plastic, I believe) so that these watches are more prone to deteriorate. Unfortunately, parts are getting very difficult to come by, as it's an in-house movement.

    Hartmut Richter

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  5. #4
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    Re: Pierce Chronographs

    Hi Hartmut,

    I disassembled a Pierce 134 recently because I simply was curious how it is
    designed. No plastics with one exception: I found a (formerly) soft plastic
    washer within the clutch. First I thought that someone tried to make the
    chrono function by odd means, and left it out. The chrono worked without
    the washer, but ran not synchronously with the sub second.

    So this washer was likely applied to provide sufficient friction with low axial
    pressure. And if it becomes hard, the clutch may slip (like without washer).
    But it is no problem to cut a replacement from e.g. thin silicone-rubber
    gasket material. As everything in this mechanism is adjustable by screws,
    even the thickness of this washer is of minor importance.

    Else everything is made for eternity, and I guess most not working samples
    don't due to misadjustment or missing parts.

    Regards, Roland Ranfft

  6. #5
    Member sherwoodschwartz's Avatar
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    Re: Pierce Chronographs

    i have heard that some watchmakers who do routine chronograph repairs will not work on pierce. i always wondered why.

  7. #6
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    Re: Pierce Chronographs

    Hi there,
    Quote Originally Posted by sherwoodschwartz View Post
    i have heard that some watchmakers who do routine chronograph repairs will not work on pierce. i always wondered why.
    Simply because they are too lazy to analyze the function. The many
    adustment devices for the travels of levers and springs make the movement
    appear complicated, but it is actually simple, and it is kind of comfort that
    everything is adjustable to get it running even with distorted or wrong parts.

    Regards, Roland Ranfft
    Last edited by Roland Ranfft; May 20th, 2010 at 01:02.

  8. #7
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    Re: Pierce Chronographs

    A knowlegable person bought my good Pierce. Now I know why. Its rumored defective movement is not, and its possible to repair or adjust.

    Fine work as usual Roland Ranfft.

  9. #8
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    Re: Pierce Chronographs

    Hi! In his time searching for information on the chronograph, so that someone might find useful

  10. #9
    Member Erik_H's Avatar
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    Re: Pierce Chronographs

    Quote Originally Posted by katolik View Post
    Hi! In his time searching for information on the chronograph, so that someone might find useful
    Excellent find!
    Erik_H
    Member NAWCC Chapter 149

  11. #10
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    Re: Pierce Chronographs

    Thank you very much all you guys: thanks

    All this information about the Pierce chronos is superb, , particularly because demystifies all about I´ve heard about the service technical problems (availability of parts is a different issue !!)

    I ´m the proud owner of two beautiful examples of these particular chronos.





    Uploaded with ImageShack.us

    On the other hand, I heard in some other forum that besides the inner "plastic" , some examples of (chrono?) Pierce used to use cork as O-rings?

    PS Hi outlawyer , you must be patient !!

    Here are the pics!!


    Saludos


    Kingmatic
    Last edited by Kingmatic; May 21st, 2010 at 21:47.

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