Very similar to one I have and case looks ok - Dennison cased a lot of UK Longines in this period as the tax on complete Swiss watches was high.
I'm not 100% sure that the dial hasn't been messed with after looking at this similar model:
https://www.blackbough.co.uk/product/longines-hallmarked-1964-wwlhgw/
- but it could be ok and just the photos
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