It's a movement from Vacheron&Constantin, and it's from about 1907-1910.
The dial is also by Vacheron&Constantin, and is looking extremely fine, since it must be enamel.
I think it was in another watchcase before, probaly 18k gold and perhaps some rare stones.
Like this one I have from 1910.
This watch is in very good condition as you can see, but still not worth a fortune !
But if you had ordered such a watch to be made today, it would have costed a fortune !
My guess is that one owner has sold the original gold case and perhaps some diamonds,
to get some cash in the hard times during the depression, and than someone has put the movement in another case,
that has been empty probably because of a broken movement !
Just my pure guess
Anyhow it is not to be considered as a genuine Vacheron&Constantin,
but I think you shall keep it as a family treasure