Any ideas on what model this is? Inherited about 20 years ago

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Morning all
Was wondering if anyone could help me identify this watch. I inherited it from my Grandad about 20 years ago. It's been serviced by Omega in the past so I know its legit. Don't have it on me to check numbers or anything unfortunately
 
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That dial suggests it was supplied in the UK market. If solid 9K gold, might have a Dennison or Shackmann English made case.