I recently was offered a 1905 3E. It was shipped from the Far North to the Deep South with a 5 day, firing inspection. Everything checked out fine, it was perfectly regulated, so it stayed heah'. It has the second set of barrels that were fitted to it, in about 1927, which are 32", have 3" chambers, a vent rib, and tight chokes in both barrels. They're engraved with the owner's name, who sent the gun back and had these barrels made and fitted. He was a member of the Philadelphia Gun cub, which was very active in shooting trap pigeons. The gun is in fine, original condition, with a HOT. Barrels carry the original blue, have .726" bores and .039" chokes ...... each of them 4+" long.
The #1 set of barrels is not with the gun now, but I know where they sleep. They are 30" long, and wear a splinter f/e.
SRH