Please can anyone help me identify this Omega watch left to me by my grandfather and where I could get it restored .
It looks like a manual wind seamaster. You will have to take the back off and photograph the movement and inside of the case back to learn more.
As you may have worked out, it's an Omega Seamaster. More than that can't be said without opening the case and getting details of the movement and its condition. However, if it's in a similar condition to the dial, then it is probably beyond saving. That having been said, and depending on your location, someone may be able to recommend a specialist who can refurbish or replace the dial and bring the whole watch back to useable/wearable condition. Be warned that it will probably cost more than the watch is worth (in purely monetary terms)