I have a "Clabrough Golcher & Co" San Francisco repro catalog dated 1895-96.
At this time they show 8 levels of Clabrough hammer doubles priced from $40.00 through $135.00. Barrels begin with Laminated, through various levels of Damascus & finally "English Laminated". From the $40.00 through $75.00 range they are apparently fitted with a doll's head & double underbolts. From the $80.00 level up they are "Treble Wedge Bolted" IE a cross bolt plus double underbolts. The $135.00 gun has a Clover Leaf rib extension with cross bolt.
I don't believe that Clabrough made the hammer doubles for Winchester. Right now I am drawing a blank & can't think of the name of the company who did. When it comes to mind will post it.