Jaeger-LeCoultre Caliber 101 and 849: A Legacy of Miniaturization and Thinness

amanico · 2020-09-08T00:00:56Z

Explore Jaeger-LeCoultre's legendary Caliber 101 and 849 movements. Discover the smallest and thinnest calibers, their history, and impact on watchmaking.

amanico

WPS member · Jaeger-LeCoultre forum

28 replies9394 views7 photos

In this insightful article, WatchProSite contributor amanico spotlights two horological marvels from Jaeger-LeCoultre: the Caliber 101 and Caliber 849. He delves into the historical significance and technical prowess of these movements, which represent the pinnacle of miniaturization and thinness in watchmaking. Amanico's exploration underscores why these calibers remain relevant and revered decades after their introduction, cementing Jaeger-LeCoultre's reputation as a master of movement innovation.

Of course we could mention many great movements from Jaeger Lecoultre. They made,since 1833, more than 2000 movements, so the list can be endless, such as the Cal 889, the 38x from the Duometre line, the Gyrotourbillons, and, of course, the vintage calibres such as those of the Geophysic, Futurematic, the Memovox...

Here, I would just show two of them, one which is the thinnest, the Cal 849, and the smallest, the cal 101.

Being the smallest and the thinnest movement is a true technical and horological defy, and at that game, Jaeger Lecoultre is a champion.

- The Cal 101, first.

Did you know that this movement was born in... 1929? Can you imagine the necessary amount of skill and talent to produce such a movement at that time?

Here you have a movement which is 14 x 4, 8 mm big and 3, 4 mm high, made of 98 parts, beating at 21, 600 vibrations per hour, and offering a modest power reserve of 33 hours.

The other remarkable detail is that after all these years, 91 years, it is still housed in some watches of the current collection. How many movements can claim such longevity?

The Reverso Cal 101, a limited edition of 5 pieces in white gold, XGT case:

- The Cal 849.

Born in 1975 under a slightly different reference, the Cal 839, when the Quartz almost killed the traditional mechanical movements, it had to be daring to decide to make such a movement. It is small, with a diameter of 20, 20 mm, but the most impressive feature is its thinness, with a height of only 1, 85 mm for 123 components. It beats at 21, 600 vibrations per hour and offers the same power reserve as the Cal 101 ( 33 hours ).

It is housed in the thinnest modern definitive watch, the Master Ultra Thin Enamel Skeleton, which is 3, 6 mm high.

Both of these movements are an important and very interesting part of JLC Patrimony. They are the heart of some horological marvels, too.

It was fair to give them some attention.

Best,

Nicolas

Key Points from the Discussion

Jaeger-LeCoultre is considered the encyclopedia and reference for the mechanical watch industry, showcasing immense intellectual abilities and resources in its movements.
While appreciating the movements, one collector suggests that the modern watches housing the Caliber 101 and 849 are disproportionately large, potentially undermining the miraculous engineering of the ultra-small and ultra-thin calibers.
The Caliber 101's enduring design and its application in pieces like the Reverso 101 are particularly impressive, with the Caliber 849 bearing a resemblance to the historical F. Piguet Caliber 21.
The 'floating movement' aesthetic in the Reverso, reminiscent of transparent Corum models, is highlighted as a visually appealing way to showcase these intricate calibers.
The Caliber 101, despite its tiny size, was primarily used in ladies' watches, and collectors note that these movements often required servicing.
Jaeger-LeCoultre's reputation as 'the Watchmaker's watchmakers' stems from their exceptional craftsmanship in creating movements that are both technically advanced and aesthetically refined.

The Discussion

PoyFR

Sep 8, 2020

I think that Jaeger-LeCoultre is the encyclopedia and the reference for the mechanical watch industry. I can see the artistic achievements but when I look at it I do not often think or see all the intellectual abilities and resources it represents. If and when I look into it a deeper, I then realise that I would need to be sitting on a school bench for ... decades ;-) Simply magnificent. Long live La Grande Maison

th.gr.ga

Sep 8, 2020

These are two truly amazing movements- every bit worthy counterparts to some of the Maison's more complicated offerings. The 101 in particular continues to impress- and the Reverso 101 is an outstanding and ingenious application. To my amateur eye it struck me that the 849 somewhat resembles the historical F Piguet Cal 21 also developed in the 1920s - another favourite caliber of mine.

W72

Sep 8, 2020

thanks for showing it..

amanico

Sep 8, 2020

Our beloved tic tacs and to measure how well they are made. That's why JLC is known as the Watchmaker's watchmakers. Best, Nicolas

PoyFR

Sep 8, 2020

Experimented watchmakers say ‘we know and call it a reliable mouvement when it has timed for 30-50 years’

blau

Sep 8, 2020

It's amazing! What a beautiful way to showcase that movement. The watch case really serving as display case for a gem.

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Jaeger-LeCoultre Caliber 101 and 849: A Legacy of Miniaturization and Thinness

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