This is a 1900 KD courtesy of Casey Chlebowski with a very interesting barrel. There is a transition (and weld line) from 'Oxford 2 S.J.' Two Iron Crolle at the breech to a 'Boston 2 S.J.', on both tubes.
The Remington Damascus Sample Rod is one of those precious Rosetta Stones that have helped translate damascus patterns: London (Stub Twist), Twist, Laminated, Boston N. (Horse-shoe pattern), Boston 2 S.J. (large scroll 2 Iron Crolle), Oxford 2 & 4 S.J. (smaller scroll 2 and 3 Iron Crolle in several different patterns), Chain J, Etoile 3. B.P., Legia P. (Herring-bone pattern), Washington N 3. B.P. ("Stars & Stripes" or "American Flag Bunting"), Chine P, Ohonon 6 S.T., and Pieper P.
http://docs.google.com/Doc?id=dfg2hmx7_72xs856hdf 
