Hi Steve, my brother in the 1970's owned a .461 or .450 (can't remember which) Gibbs Farquharson with Selous sideplates that he bought from Gary Herman of Safari Outfitters. It was bought unfinished (needed some small internal parts and a mainspring) he finished it and later sold it. It was in almost unfired condition. He sold it in the mid 70's. I wonder if it is the same rifle. Gary Herman said it was made for Selous, who never picked it up (but who knows?)