Drew can correct me if I'm wrong on this.
I think your barrels look a lot like these tubes on a GH-12 Parker I have. These barrels are marked Damascus but they are different from the normal pattern seen on grade 2 hammerless guns. They also have a Birmingham provisional proof mark on them & were probably English in source. You might look yours over for a proof mark.
The Birmingham proof mark is on the right tube in the bottom picture.
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