Maybe copper or bronze wool but never use any abrasive that will scratch or mar the finish. I would recommend first finding out what you have before any attempt to “clean” it up. There’s a possibility you could considerably lessen its value by doing so.
Hi-res pics of the complete lock plates with hammers, the underside of the frame, the legend on the rib on the top of the barrels.
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__________________
"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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