Over on Gunboards, the member 2520WCF suggested that I post some photos of my Flues. I traded a pistol for it; from what I've learned it is a field grade, but marked as a special; one barrel is from Belgium, the other, the US. Chokes are cylinder and modified. (From ShotgunWorld: The tube on your gun marked LLH came from Lochet Habran of Jurille, Belgium. The tube marked SB&Co. came from Sanderson Brothers, originally an American branch of a Shieffield, England, company located in Syracuse, NY, but by this time part of Crucible Steel.)
what looks like rust is actually oil in this picture