Longines cal 431, how is it?
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Thread: Longines cal 431, how is it?

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  1. #1
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    Longines cal 431, how is it?

    Hi all.

    The local watch dealer has got a late 60`s, maybe 70`s Longines in SS marked Ultra Chron, seller say it has a 431 cal inside.
    Well, I do know that the 431 cal was Longines first high beat rate movement, I do belive I have read somewhere that they did rate it down after some years...
    Anyhow, how is these movements?
    Good, solid Longines, that stil can go a long way?

    Cheers

  2. #2
    Member gatorcpa's Avatar
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    Re: Longines cal 431, how is it?

    This was Longines first attempt at a 36,000 beats per hour movement. They made a lot of them from 1966 through 1972, but deferred maintenance caused many of these to wear our before their time. In 1972, Longines changed to the cal. 665X series of movements running at 28,800 bph to replace the cal. 431.

    If you can find one if good shape, just remember that it will need TLC at regular intervals to run well. I have a cal. 431 Ultra-Chron that was running at about 3 sec. per day, then developed a slipping cannon pinion. It's now at the watchmaker getting fixed up.





    Take care,
    gatorcpa
    busmatt likes this.

  3. #3
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    Re: Longines cal 431, how is it?

    Hi.
    Thanks for the help and information.
    Nice looking watch you got, btw.
    I will have a look at the movement and ask what a service will cost.

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  5. #4
    Member Horological_Dino's Avatar
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    Re: Longines cal 431, how is it?

    It will wear down quickly if it is worn on regular intervals but the Ultra Chron was marketed as the world's most accurate watch when it was first released.

    Sent from my SHV-E160K using Tapatalk

  6. #5
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    Re: Longines cal 431, how is it?

    Thanks for the information. Think I will pass, as it will be used on regular base.

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