No one has mentioned it, but the first thing I think of when the top rib says "Damascus" and the barrels are blued is Sleeved Barrels. Granted, I don't see any tell-tale lines just forward of the chambers in the pics, but you want to look very closely to see if it might have been sleeved. They might even be marked "sleeved" on the flats or bottom of the tubes.
Jim
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