Cal 492 for vintage chrono

I looked for the history or some information/details in VC books about this caliber, but unfortunately cannot find any...
I would like to know when it was launched and for which kind of chronographs (references). Did it come from JLC?
I join a photograph of it (I think it's the right one) to know your mind about it.
Quality? Comparison with the 434?

Cal 492 for vintage chrono

Thank you for all coming info.
Cheers, Patrice
I believe it to be a Valjoux 22 or 23 (nt)
11/11/2008 - 14:51
Thank you Alex.
11/11/2008 - 17:28
So, we can consider it as a good movement I think. What about my other questions? Thank you for more details Alex
I'm searching. I have a document which lists the same details for the
11/11/2008 - 17:39
2 calibers but give me some more time...
Cal 492 is a Lemania version,
11/12/2008 - 09:53
13 lignes (30.00 mm), as all vintage VC chronographs. 5.80 mm high. Cherrs Doc
Hi Doc the Lemania 2320 dates from the mid 40s so VC could not have
11/12/2008 - 12:46

used them before this date considering furthermore that to the best of my beliefe it was reserved only for Omega.

11/12/2008 - 17:08

I only refer to the book by Anton Kreuwer's,  containing dates of the only chronograph cal VC in his list. That is Cal 492 with the figures I left. I also looked in"The Chronograph Bible" by G Lang and Reinhard Meis , "Chrongraph Wristwatches". Of all images, sorrowly most of them black and white, it looks most like Lemania movements, at that time, especially the rounded bridge, where it's stamped adj to time and VC 492. Most of others are more straight except some Valjoux and Landeron's. But all the movements are very similar at that period of time, and we suppose VC bought ebauches, don't we ? So it's not more than a suggestion. I don't think it's LeCoultre, there is only 1(!) picture of a movement from them, in the whole book. So take it what for what it is, a guess Doc

you are correct on the specifications but I did have my doubts on the
11/12/2008 - 17:29
ebauche. I thought at first that the Valjoux 23/23 evolved into the Lemania 2320 but I spoke to a watchmaker who used to do a lot of restauration work but he told me that they were tyo different models. Surprisingly the movement of the ref 6087 with Bull Horns is based on a Victorin Piguet ebauche! So there is a lot of guess work here as you say, I'm trying to do some further research on my end and hope to get a straight answer.
This is the book with most movements of chronographs.
11/13/2008 - 17:10
Of course are all not there, but when you read it,  you see that most movements werere, very similar at the time we are talking of, and later also The finishing of different watchmakers, is the key to why it's so difficult to identify the ebauches, I think. Doc
Thank you all for your precisions.
11/15/2008 - 16:17
It seems it's not so easy as at first glance. Patrice
I dont think this is a Lemania movement. I compared my 47120
11/12/2008 - 12:19
with it and its not really the same.