My 1889 vintage, heavy, Quality 2, 2-frame, hammerless, Damascus barrel 12-gauge gun, was fitted with a set of Vulcan Steel 32-inch 20-gauge barrels, sometime after they changed the rib address to CT, U.S.A. At that time the gun was fitted with the post-1910 bolt and bolt plates on both sets of barrels.
The gun is currently with Craig Libhart for new wood and a reblue on the 20-gauge barrels. My appologies to regulars getting tired of these pictures of my old two-barrel two-gauge set!!