Omega Geneve watch,1970s ID help

Hi, I inherited an omega watch from my grandfather about 10 years ago.
I believe that he bought it around 1976 when he retired. He was not a wealthy man so this was a big purchase for him. I think he bought it from a jewelers in Sheffield, UK.
I don't really know anything else about the watch other than he did get it serviced / cleaned once.
It has a fixo flex strap and says waterproof on the back.
Condition wise it does have so scratches as my grandfather wore it daily.
Could anyone help with a model number or idea of what it may be worth?
Many thanks!

Nice one. wish I was left an Omega

Get it serviced and cleaned up but I would keep the battle wounds. It’s not a highly collectible piece but the value of it being your granddad’s is high so I’d keep all the dings and scratches he made one it. I’d ditch the bracelet immediately.

There are some horror stories of those eating through the lugs. Get it on a nice strap and you’re good to go.

I’ll leave the UK based guys to recommend a good watchmaker for the service. I’d get that done before winding it up and wearing it around.