Call Dean Harris in Tahlequah, OK. You can trust what he says.
Amen, Stan. My thoughts exactly. For whatever it may be worth, I have no reservation or compunctions about installing thinwall chokes in any classic American, English, or Continental double gun, no matter the grade, lineage, or worth. They are, for all practical purposes, invisible, and greatly increase the versatility of whatever they are installed in. A couple of caveats: no sense in doing them in a gun that is just fine as-is, and I would also not consider anyone doing them other than aforesaid Dean Harris at Skeet's Gunshop, Briley, or Teague. An additional thought: I cannot think of any reason a Damascus-barreled gun would not be a candidate vs fluid steel if it's being used regularly with modern loads as-is.
JR