Not Damascus, but Twist Steel. If the gun was rebarrelled at Parker Brothers after the advent of 3 1/2" ten gauge shells, the gun could be factory chambered for them. Dave Noreen can tell us what the date of introduction for 3 1/2" ten ammunition, and maybe the PGCA letter will shed some light on a possible rebarrel from eight gauge. Some eight gauge Parkers were rebarrelled to ten gauge, and maybe twelve gauge after eight gauge guns were outlawed for waterfowl. I have one of those in my collection, and maybe now I have two.
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