Old constellation - Help / advice

Hi All,
I have an old Constellation that was left to me by my father, it has been in storage since 1991. I have recently got it out and decided I should get it serviced and valued.
I did take it to a local jeweller but was not happy with comments he made and would not leave it with him (seemed a bit dodgy as he would not open the case whilst I was there so I could verify the serial number!), I live in the UK, West Midlands and have since been advised to take it to The Jewelery Quarter in Hockley B'Ham and check with a few shops for quotes on service.
I have tried to look the watch up on the Omega web site but can't find anything similar, I don't know its age or what model etc it may be, I think it may be 18K from one of the hallmarks on the strap but can't clearly see the mark on the watch case.
I would be grateful however if anyone can give any helpful advice or can identify what year / model it may be?

Here are a few pics;

Hi Alex
Welcome

You have a gold C- cases Connie
In pretty good shape too although I suspect the case has seen some polishing
There was an interesting discussion on the forum re gold straps recently
Search 'my vintage omegas' thread
Also look up Desmond's Omega Constellation collectors blog
Loads of info on there
As for servicing - ideally you need a vintage watch specialist rather than just a jeweller who services watches - I don't know if there are any in B'ham
Once opened - very carefully as gold is soft and scratches easily - you can get the case type and serial number
Hope that helps

From a German catalogue, 1964, and from my favourite starting place when investigating watches:
http://www.old-omegas.com/




Fr0m 1966 UK catalogue