Help with ID please

Welcome to the forum. I've seen this watch before, but I'm blanking on the reference at the moment. If you could have it opened and post photos of the inside, all will be revealed.

Regarding restoration, the challenge is that someone appears to have attempted to clean the dial, and unfortunately washed away some of the printing. It will not be easy to find someone who can do a good job fixing that. However, if you're ok with the dial as it is, you can certainly have the movement serviced and the watch will be ready to wear. Because it is not water resistant, you will want to avoid even incidental moisture.

No need to send it to Omega as, although they may do a good job, it could come back looking nothing like it was before, which is what your father saw when he looked at it.

There are a number of independent watchmakers in the UK that would be able to service your watch.
Our UK members can help with some recommendations.

Really you don't need to use the word "restoration" because that is going to cause confusion about what you want. What you want is a movement service, sometimes called an overhaul or a COA (clean, oil, adjust). They can polish the crystal for you, but I really wouldn't recommend anythings else.

Search the forum for similar threads, there have been many in the last couple of months asking for recommendations for independent watchmakers in the UK. Budget a few hundred GBP for a basic service.