In that the Twist barrels are marked Conn. they are prior to 1918 when they changed to CT., U.S.A. on the rib marking. Is the barrel lug fitted with a bolt plate and the action a new style bolt? 1905 style bolt plate? 1910 and later style bolt plate? My 1889-vintage GH-Grade heavy 2-frame Damascus barrel 12-gauge was back to the Brothers P for a set of post-1918 Vulcan Steel 32-inch 20-gauge barrels and got the updated bolt, and the post-1910 bolt plates on both sets of barrels.
