Re: Any information would be welcome!
Campbell, Hope and King had a depot and bottling plant in Elgin, and bottled whiskies as well as beers there.
Re price - if WE offer £75, I'd be surprised and I would certainly take it. It might be an old-ish bottle, but it's just 5yo Glen Grant that's inside. Which is not close to being the world's rarest nor most collectable whisky.
ps - re the label - Glen Grant supplied the standard GG label to customers such as CH&K and Gordon & Macphail, with a space where the customers could print their own names and details - which is what CH&K obviously did in this case.