Jerry: check the first few pics at the beginning of the 'Damascus Barrels' PictureTrail
http://www.picturetrail.com/gallery.fcgi?p=999&gid=16082038BUT Parker used what they called "Fine Laminated Steel" on Qualtiy H,I & O hammer guns, and it is probably One Iron Crolle (and a step up in quality from Twist)
Bottom Line: Belgian 'Laminated Steel' = Twist
British Laminated Steel = extremely good stuff that won the 1891 Birmingham Proof House test
You can read the Proof House test in
Double Gun Classics e-zine
http://www.doublegunclassics.com/alt/DGCJanFeb06.pdf