Smallest w.w. lever movement
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  1. #1
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    Smallest w.w. lever movement

    LeCoultre's model 101 from 1929 is 14 mm X 4.8 mm but made in two layers of 74 parts and is 4 mm thick. I think their greater accomplishment for small size is the fine performance 17j conventional lever movement of about 2 mm X 20 mm hidden movement in gold coin w.w. Unable to find any info about it so would appreciate any details. artb

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    Last edited by artb; November 14th, 2015 at 14:36.
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  2. #2
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    Re: Smallest w.w. lever movement

    Quote Originally Posted by artb View Post
    LeCoultre's model 101 from 1929 is 14 mm X 4.8 mm but made in two layers of 74 parts and is 4 mm thick. I think their greater accomplishment for small size is the fine performance 17j conventional lever movement of about 1 mm X 20 mm hidden movement in gold coin w.w. Unable to find any info about it so would appreciate any details. artb

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    Nice watch.
    Actually the 838 has 18 jewels, and is 1.85 mm. high.
    Check your PM's Art!
    Last edited by bobbee; November 13th, 2015 at 13:35.
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  3. #3
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    Re: Smallest w.w. lever movement

    The coin watch you post, has no relationship to the Jaeger-LeCoultres "Duoplan" movement (caliber 101)

    I can not quite read the caliber number but looks P238?
    Where "P" is Parachoc - Duoplan has no shock protection!

    Adam
    Last edited by HOROLOGIST007; November 13th, 2015 at 15:42.
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    Re: Smallest w.w. lever movement

    And all this time I thought "smallest" referred to overall size, not thickness?
    https://mb.nawcc.org/threads/westfield-watch-company.109201/

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    Re: Smallest w.w. lever movement

    Quote Originally Posted by simpletreasures View Post
    And all this time I thought "smallest" referred to overall size, not thickness?
    I think it does that is "overall size"??
    Adam
    NEVER ARGUE WITH AN IDIOT. FIRST THEY WILL DRAG YOU DOWN TO THEIR LEVEL. THEN, THEY WILL BEAT YOU WITH EXPERIENCE.

    "Failure is not an option" - Gene Kranz
    "Owning a vintage watch is great, understanding where it sits in Horology is magnificent"
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  7. #6
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    Re: Smallest w.w. lever movement

    I don't know about the smallest movement (diameter, not thickness) with a lever escapement, but this one here is part of my movement collection: ETA 2412, 6 3/4 lines (equalling 15.2mm), 17 jewels, incabloc, 21600 half beats/h, power reserve 40h (!) and still a pleasure to watch on the timescale. You could make a coin-watch with this movement and 1 US cent as a dial (19mm diameter and larger than the dial which is on now) and there would still be room enough around.

    Example shown in the Ranfft database with a different type of balance balance wheel:

    http://www.ranfft.de/cgi-bin/bidfun-...2uswk&ETA_2412
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    Last edited by Border-Reiver; November 13th, 2015 at 16:25.

  8. #7
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    Re: Smallest w.w. lever movement

    If you go by volume, the 101 has a slight edge.

    Either way, they're both amazing movements for what they do in the space they need to do it.

    I was always partial to the 101 for the utterly ridiculous ladies' watches it allows JLC to make.

    (Pictures from JLC's website and ablogtowatch, respectively.)
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  9. #8
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    Re: Smallest w.w. lever movement

    101 was and still is the smallest manufactured movement.
    Launched in 1926 it ran at 21600 BPH and came with a lifetime Lloyd's of London WW Insurance!

    It was and still is to-day a remarkable piece.
    Only two people at Jaeger are trained to repair and service them
    An old tome skilled and an apprentice
    adam
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  10. #9
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    Re: Smallest w.w. lever movement

    The 838 in Art's coin watch is a lot "thinner" than the 101, at 1.85 mm. while the 101 is 3.4 mm.

  11. #10
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    Re: Smallest w.w. lever movement

    An old article that mentions Bulova's "smallest watch in the world" from Sept. 1922.





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    It was re-released in 1926, doing tours of Bulova's distributors.

    Below is actress Irene Bordoni wearing the back winding watch in 1926.





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    And in 1927, we see more advertising.




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    At less than 18 mm. the movement was even smaller, probably around 16-17mm. in diameter.
    An amazing feat in 1922.

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