Help Identifying Grandfathers Watch.

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I was hoping someone on this site was able to help me identify the watch my grandfather had. I don't know much about this particular one other than that maybe the band is not original. Its back is engraved with his name and a year i'm assuming it was given to him. Any information on it would be great cause I'd love to see if it is worth servicing. Thanks for any help.

 
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Looks like it could be a gold plated reference 166.041.
Monetary value isn't huge, around £/$300, it's the sentimental value that will determine whether it's worthwhile getting it serviced.