Overseas automatic ladies?

Hi guys,

I'm about to buy my first Vacheron Constantin. Although "my first" will be my girlfriend's new watch. It is an Overseas Automatic for Ladies of the previous Overseas colelction. The seller told me the reference number is 12050. 

Somehow I cannot find any informaion about this model and I'd love to learn more about the movement and other specifications. Hope one of you might be able to shed some light on this. 

Overseas automatic ladies?

All help/info is welcome! Thanx in advance and I wish you a great Sunday!

Good to see you here Frank:-) don't have the ref number but looks like
06/24/2012 - 16:06
The original Overseas model launched in 1996. Two men's sizes were available 35mm and 37mm yours is probably the 35mm version which did not have date. It houses Cal 1310 which is based on GP cal 3100
Re: Good to see you here Frank:-) don't have the ref number but looks like
06/24/2012 - 16:21
Thank you Alex.  I wouldn't mind a diameter of 35mm, because that also fits my wrist :-) However the seller told me the diameter is around 24 mm. Searching the internet I did find some info about ref. 12050 however I could only find yellow gold examples. 
Hmmm the 24mm was quartz, need to check
06/24/2012 - 20:45
M
Uses cal 1056 based on a GP cal but don't know which one
06/25/2012 - 19:24
M