If I could find the image again I'd be able to tell you. But I can't find it! Hence my question - Whose Rigby is this? Once we know whose it is, it might be possible to find out about the scope mounts.

I know that I came across the image while looking at posts about Mauser M98s and Rigbys. That hasn't helped me find it again though. Reverse image search with Google Lens wasn't any help either.

Hopefully, someone will say, 'Hey, that's my rifle! And my giraffe!'