Allen I think the most precise terminology is that these barrels are not Damascus but are a variety of London Twist Damascus is a croille pattern resulting from multiple stacked ribbons which are twisted then hammer forged together to make a broad band which is then twisted around a mandrel. Twist is alternating stacks of short segments of iron and steel which are twisted about a mandrel.
So twist is not Damascus but both are composite forms , both are strong and both are attractive
The Purdey Twist has that added swirl. Very nice.
Anyway that's my thoughts We have others here who know much about composite barrels and I look for their comments.
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