Mike, I hope the barrels measure up to be safe. If so, my reading would suggest that the NIDs were mechanically at the top of the heap of American SxS’s.

Dewey Vicknair certainly thought so in his classic 2016 critique of American double gun classics which deserves re-reading:
https://vicknairgunsmithing.blogspot.com/search?q=Comparison+of+American+gunmakers