Hi Ploughjogger,
I am dictating while doing something, but the texture of the barrels looks like a crolle’ pattern to me.
Perhaps I am wrong.
You don’t list your location, so it’s impossible to recommend a nearby Smith that you could have examine your gun.
There are East Coast guys north guys south guys Midwestern guys mountain state guys West Coast guys Southwest guys that all are good dependable craftsman. You’ll have no trouble at all finding one that will render an opinion on your shotgun in person.
