Waltham ETA2391
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  1. #1
    Member riggerparish's Avatar
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    Waltham ETA2391

    Hello everybody!

    I found this "2391 ETA" behind a Waltham dial that looks like its from the 1960's. However, even though it seems Waltham was a bastard child at the time, I would have thought some sort of Waltham inscription would be present on the movement.

    Is it possible that this is not a real Swiss Waltham movement? I am not a watch expert... were these movements reproduced a lot?

    Many thanks!

    RP
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  2. #2
    Member Dan S's Avatar
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    Re: Waltham ETA2391

    WXO is the correct import code for Waltham Watch Co.
    Chascomm and riggerparish like this.
    -- Dan (formerly known as @badbackdan)
    ------- @oldwatchdan on Instagram -------

  3. #3
    Member Old Navman's Avatar
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    Re: Waltham ETA2391

    Is that a special Waltham up jeweled version of the ETA movement? Ranfft lists this movement only with either 17j or 21j.
    Those train wheel jewels look almost non functional, as if stuck there with a glue.

    ETA 2391

    Features
    manual wind
    sweep second

    Data
    11.5''', Dm= 25.6mm, Do= 26.0mm
    H= 3.6mm
    F= 1.4mm
    T= 1.85mm
    17/21 jewels
    f = 18000 A/h
    power reserve 47h
    Nobody knows Everything, but Everybody knows Something!


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  5. #4
    Member riggerparish's Avatar
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    Re: Waltham ETA2391

    Thanks for the input guys.

    I had the same concerns as you, Old Navman. I did some research and didn't see any 25j versions of this movement and I have never seen any train wheel jewels like this. Also, the clip that holds the end stone in place looks a little different from most I've seen.

    Thanks!

  6. #5
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    Re: Waltham ETA2391

    The balance shock-protection unit is OK, just another type. It looks like a Trishock or similar.

    Are those cap jewels on the train bridge sticking up proud of the surface, or does it just look that way and they are actually pressed down into holes?

    Thanks.
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  7. #6
    Member riggerparish's Avatar
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    Re: Waltham ETA2391

    They are indeed raised up out of the train bridge. Here is a picture from another angle.

    The US Pat 2478865 refers to "Lubricating jeweled bearings of watch movements and like instrument parts".


    Name:  waltham2.jpg
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    Dan S likes this.

  8. #7
    Member riggerparish's Avatar
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    Re: Waltham ETA2391

    The imagine quality of the last photo (courtesy of my wifes phone) showed me something I didnt notice under magnification. There was a plate on top of the train bridge.

    So, for those interested, here is what was found underneath. So, is it 17j or 25j?

    Name:  waltham3.jpg
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    Name:  waltham4.jpg
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    Has anyone seen this before on a watch?

  9. #8
    Member Dan S's Avatar
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    Re: Waltham ETA2391

    Maybe there are eight jewels in that plate.
    -- Dan (formerly known as @badbackdan)
    ------- @oldwatchdan on Instagram -------

  10. #9
    Zenith Forum Co-moderator
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    Re: Waltham ETA2391

    ...or maybe the same trick was applied dial side.

    Hartmut Richter
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  11. #10
    Member riggerparish's Avatar
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    Re: Waltham ETA2391

    Quote Originally Posted by Hartmut Richter View Post
    ...or maybe the same trick was applied dial side.

    Hartmut Richter
    You are correct in assuming the dial advertises 25 jewels, Mr Richter!

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