Unusual jumping mechanism, Elgin(?)

Discussion in 'American Pocket Watches' started by amacks, Mar 19, 2017.

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  1. amacks

    amacks Registered User

    Mar 21, 2010
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    I bought this identified as an Elgin, but don't see much to support or dispute that. It appears to be a 16sz jumping mechanism, but not an incomplete movement, since there aren't nearly enough holes in the baseplate. There appear to be 4 jewels (though there may be a jeweled pin for 5, I haven't checked). The escapement appears to be all steel, both lever and wheel, and the teeth of the wheel are beveled in a way I can't photograph. The basic flow seems to be steel flywheel/attached f-shaped blue-steel piece rotates CW, provides impulse to a gear (one directional, the teeth are not symmetrical but more like a saw blade) at the top of the escape-wheel shaft.

    The f-shaped blue steel piece kinda looks like jumping-second mechanisms I've seen before, but other than that, I've got no ideas. There doesn't seem to be any way to input/extract power except the steel flywheel (2 o'clock, second image).
    Anyone have any thoughts?
    [​IMG][​IMG]
    Aaron
     

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  2. GeneJockey

    GeneJockey Registered User
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    Mar 2, 2012
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    The triangular hairspring stud is what Elgin used for 90 years, from the first keywind watches in 1867, all the way till about 1955. Hairspring overcoil shape would also be a good indicator.
     
  3. 4thdimension

    4thdimension Registered User
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    Oct 18, 2001
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    You got an interesting piece there! The serial number font seems to be from Elgin as well. The undecorated balance cock would, to me, indicate a factory prototype as opposed to an individual experimenting with Elgin parts. I see the resemblance to a jump mechanism. I wasn't aware Elgin ever produced one. Perhaps this is as far as they got? Interesting find!-Cort
     
  4. Jerry Treiman

    Jerry Treiman Registered User
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    Aug 25, 2000
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    This is almost certainly an Elgin product. I think that all of the watch companies produced specialty items for the military during WW2. Here is another Elgin product - a platform escapement. It measures 0-size and appears to use a 16-size escapement. The number on the back - 31322 - is close enough to the 31595 on Aaron's piece that I wonder if this isn't a part number or contract number rather than a serial number.
    31322platform.jpg
     
  5. amacks

    amacks Registered User

    Mar 21, 2010
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    That makes more sense as a contract # or something "military" than a serial #. As a straight SN, it would be way too early

    I would also agree with the comments that it might be some sort of prototype or sample, I don't have a good picture of it but the side of the non-balance cock is plated, but otherwise unfinished, there are still saw or casting marks on it

    Aaron
     
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