This a classic watch from the late 1950's.
It's I suppose cal.1001 ?
We generally don't discus prices here.
Firstly because that's a private thing and secondly you can hurt someone,
or most of all, the prices depends on so many factors.
It could easily be a double amount for an identical watch.
It also depends where, which country and from where you bought it.
VC's are generally very "cheap" at auctions in Germany!
It also depends if you bought it private, from a dealer, a friend or at an auction.
Anyhow there is a catalogue from 1997, with about 300 watches pictured and priced at auctions,
in Germany, 80 of them are Vacheron Constantin.
But do remeber that the prices, in my opinion are about half of what I think is the normal value,
for most of the VC's, at least!
I happen to own some of the models pictured,
and have paid about the double and even more for some of them!
Anyhow the catalogue is very cheap (sale) and intersting, that it's in Germanlanguage doesn't matter,
if you can't read German, because the text is only technical facts and the prices are in EUR.http://www.heel-verlag.de/lshop,showdetail,27814,d,1230452064-28210,uhren,3898803600,11,Tshowrub--uhren,.htm
Once again congrats,
and the value is how much you like it