Service for Vintage Omega Seamaster 300

[JS1500]

Hello,

I'm looking for recommendations.

My 1968 Seamaster 300 needs a service/repair and I wondered if any of the good people on this forum could recommend a trusted independent service centre?

Ideally I'd like the following carried out;
Service / repair
Cleaning but not refurbishing the case or replacing any cosmetic parts
Valuation
Photographs of the movement, inside case-back etc.
Warranty

This is with a view to selling the watch (unfortunately, needs must).

Thanks for any help.