4th Gen 1931 bent "pot", with the Espresso finish. One night, at a pipe club meeting, I packed it with some Squdron Leader, put it in my bag, and forgot about if for a few hours. Later that night I remembered it and lit it up. I achieved Nirvana that night, for sure. One of the best smokes I ever had. Now, I broke the pipe in with VaPer blends, which never seemed to be as good as another Neerup pipe I have that is excellent with VaPers.
The difference between the two objectively is that the 4th Gen is a group 4 chamber, and the Neerup branded pipe is a group three. That being said, my Ligne Bretagne group 2 size pipe smokes English blends well, but doesn't do well with VaPers either. Sometimes it's the luck of the draw.