I'm not sure what info you are looking for about the 475 #2. I can tell you that the most accurate double I have ever seen, or even heard about, is a 475 #2 Holland. 8 shots inside an inch at 100 yards.

It belongs to a friend who refuses to sell it for some reason.

It will do anything that any of the others will. It will make a bigger thwamp when you drop it in the chamber.