I bought this one at an auction without a close inspection. It was cheap enough and I could tell it wasn't a normal TC barrel. It appears to be a TC stock and lock, but the barrel is .45 caliber and 35-7/8" long from the crown to the front of the breech plug. The only markings are on the bottom in the breech area, it's stamped ".29", ".450", "1.60" and "HH" (or possibly "RR", it's sort of light on one side). It has 6-groove square cut rifling and doesn't appear to be swamped.