dmh,

Interesting barrels. Take a good look. The damascus pattern changes from the breech to the muzzle. It starts out as a twist and finishes in a crolle. That is unusual. They obviously welded a second billet in which is normal. Whether the change in pattern was intentional or a mistake is any one's guess. There is thread going that you may finding.
http://www.doublegunshop.com/forums/ubbt...e=1&fpart=1

Pete

http://www.damascus-barrels.com/Movie.html