Omega Constellation sevice and value

[SFO]

Just got this out from storage. Not been worn in years. It’s at least 35 years old.

Works, but very inaccurate.

Any idea of its value?

And suggestions on where I can get it serviced please? The first quote I got from Omega was at least £600.

Thanks.

[RiggaTheMighty]

Lovely watch, don't see a lot of the one piece watches.
I would have said its got to be worth in the region of £2K or thereabouts.

Service would be £150-200, dependent on parts required.