Pun
2035
May I ask when did they change it?
Apr 15, 2021,08:53 AM
Just wondering whether my TT 1931 bought in 2017 was with the new one or the older calibre...
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Jaeger-leCoultre cal 822
By: chippyfly : April 15th, 2021-04:45
I have only recently discovered that JLC has revised the construction of its long established calibre 822 movement, still used in many of the new Reverso's. The triovis regulator has gone and the balance is now spring-free inertia with a revised balance c...
Here are two shots from the 2013/2014 catalogue
By: eklektik : April 19th, 2021-12:32
The TT1931 was not on the 2015/2016 catalogue, so your watch must have been left on the shelf until your acquisition. The photos show the 21 jewel movement. Best, E. ...
Shock protection
By: cazalea : April 15th, 2021-14:54
I’m going to tackle one of your questions first. Shock-proofing is most important when the rotating mass is high and the likelihood of shock is high. An example would be a large balance wheel on a slow-beat pocket watch. It’s quite common for balance whee...
A look at the movements
By: cazalea : April 15th, 2021-15:37
No cap jewels on the escape wheel, no "manual" adjustment Escape wheel cap jewels and shock absorption, adjustment on balance (but lots of weights on heavy balance wheel) As for why change it? I think of a comparison with fountain pens and ball point pens...
Possibly so
By: cazalea : April 16th, 2021-06:54
On the other hand, it is nice to clean and lube a movement, put it back together and not need to tweak things. In theory it won’t change once set when built, and a balance never goes in the cleaning machine (in my experience). Perhaps better, perhaps not ...
Hi Clive, I just received this answer from the Manufacture:
By: amanico : April 19th, 2021-01:10
" The choice was made to update the calibre 822 with a free sprung balance wheel as they are considered far superior in chronometric performance than raquetterie. It enables better adjusting and better performance all together. As far as the removing of t...
Pleasure.
By: amanico : April 19th, 2021-14:05