you can buy from Heel Verlag in Germany.
It's more in it about VC and a lot about other vintage brands too.
I don't think I violate any rules buy giving you the link :
Alex if you think this is not OK, you may delete this post.
But I don't think it's worser than mention WatchTime, because it's a very good watch magazine,
the best in my opinion, ArmbandUhren, that's behind the catalogue.
It's just now extremely cheap 10 EUR !!!
So as enthusiasts I think you should order one.
Germany is still the cheapest country, in my opinion, concerning Vacheron&Constantin!
UK, Italy, Switzerland and France all have higher prices on vintage V&C's,
that is my experience !
Anyhow those price seen in the pages I shown you will be hard to find