I have been watching the Purdey also, and I agree on the Irish registation numbers on my research is in the book the early Purdeys, serial number shows that gun made in 1836 and also sold with a extra 36 inch barrel (not stated if it was a shotgun barrel or not) but was says 16 bore. so a little confusion there, I am guessing not the original case but is isnt stated to be the original case either. So the records are either wrong on caliber or the mold isnt correct. The double 12 is a nice gun but the 4 bore confuses me also with the 33 inch barrel and no ramrod, almost as if it was a heavy live pigion gun that got rifled but who knows as many things were done in different ways