Thomas: I also believe those are blued Damascus barrels. Put a dab of white vinegar on a soft cloth and rub an area underneath the forend (where it won't show). This will remove the blue and the Damascus 'scrolls' should be visible, as they are on the watertable.
What is the wall thickness?
A GH with blued Damascus
These Twist barrels show the faint sleeve weld line with the rib re-engraved "Spec. Steel"
