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pmwas

The Three Emperor's Corner - part ten - an old rusty Jacot

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This post is about another old watch from Imperial Russia I've found.
Again - it's a wreck. And a rusty wreck this time:



Hopeless piece!
At first - I straightened the pivots. This was crucial - if a pivot broke, this watch would go to parts bin.
However - the pivots prooved soft and bendable. The top pivot is also ridiculously long - looks like a custom made staff.

The watch turned out RUSTY!



Rusty balance, rusty escape wheel, rusty keyless works, super-rusty ratchet wheel that I managed to take apart somehow...

Preparing parts...
The watch has a weird set of old style hollow-arbor center wheel and a 'modern', cannon pinion, to which the minute hand is attached. I don't know if the center arbor is custom made as well, or if it's just broken, but it's just half-long and leaves a visible hole on the top side.



I punched the arbor into the center wheel till tight and then shortened it to match the cannon pinion.

Now - assembling:



The watch has a lever operated keyless works. I did my best to remove as much rust as I could, but it's very difficult. Especially the screws are tricky. I think some screws should be replaced and the parts filed down and repolished...

Assemblling on:



The gear train is made of brass. I needed to re-rivet the center gear on the pinion.
The click is elegantly hidden under the plate.

The escapement is rusty and I did not manage to clean the escape wheel.
I don't know - the part seems very fragile and I'm afraid to do too much mechanical cleaning on it.



The watch has an all-steel double roller escapement, indicating pretty good quality.
It also has anglaged plates edges and Geneva stripes and three additional (likely non functional) cap jewels, rising the jewel count to 18.

The balance wheel is bi-metallic, but uncut, and has small brass timing screws:



The dial is held by screws located on the side of the movement.
It's marked George Favre-Jacot in Russian transliteration and it's single pressed.
I assembled the movement and it started off with very nice amplitude.
I think we all like nice amplitude, only the rusty hairspring did not...
Next day I discovered the hairspring broke after two hours.

That meant trouble. Try to find a correct hairspring for this watch!
Of course, I have mostly American parts and most American balance wheels were heavier than this.
Searching through all my stuff, I got just one hairspring that would fit this balance, so I did not have much choice.
Still, fitted with the hairspring, the balance's beat rate rose to 19,800bph!

Any ideas? Well - I had one:



Have I gone too far? I've replaced the screws with heavy ones. Four big ones, as big as I could fir, and a set of Elgin 12s mid-size screws. As for the quality - beautiful American screws look like a million bucks, especially compared to original crap-screws, but this surely compromised the original looks. On the other hand - balance screws are meant to be replaced and adjusted, like wheel rim's weights in a car...

With the 'new' balance - the watch works quite well. With good amplitude and rate, somewhat (like 5min) slow in the center position.

Casing:



The watch has a silver, Diogenes and George Favre Jacot marked, case.
Diogenes, GFJ are both trademarks of the same manufacture, but I don't recall seeing them together on one watch.
Notice the movement is also double-marked, Diogenes on the movement and GFJ on the dial.
The case is marked '23 jewels' (not even [23] jewelled like last time), but that's obviously not true.



I fitted a set of hands (yes, I'd like a better second hand ) and the watch is now done. Sadly, it does not have the bezel.
It's no big deal - a busted Georges Favre Jacot missing bezel, rusty and mutilated, but certainly, as a fan of Imperial Russia's watches and Zenith brand - a must have for me. Even though tis wreck was not worth the money.
I'm glad I made this tick and keep time again - so cool to see a movement wake up after some time, still - a shame about the broken hairspring...





Thanks for looking !
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Updated 07-26-2017 at 12:58 PM by pmwas

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Comments

  1. kinsler33's Avatar
    That was a lot of very dedicated work, but it's a nifty old watch. Imperial Russia, no less. I suspect you'll find a bezel for it, too.

    Mark Kinsler