Cataloged or non-cataloged, they ain't gonna redesign an action just to build a gun, custom made or not. And it's not that hard to identify features of a particular action, if you have photos to look at. (Guns in hand would be better, but a lot more difficult.) The Imperial Premier is cataloged, and this gun certainly does not come up to that standard. Nor a Premier, if one regards "stocked to the fences" as an important distinguishing feature of a British "best" sidelock--which seems to be the way they looked at things.

But it's still a very nice gun.