The barrels pictured are not stub twist.As pointed in earlier posts, William Greeners book,"The Gun 1834", describes in detail the material and process for manufacturing Stub twist/damascus barrels.
Richard Akehurst,s book, "Game Guns and Rifles" page 35 pictures stub twist showing the lump of horse shoe nails stubs from which the ribbon is being formed prior to coiling. Page 26 of this book also shows the figure developed on stub iron barrels.


Roy Hebbes