Hello Thomas,
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from the pictures I‘m afraid that this is a just etched structure and there will be a risk to polish and clean them away.
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I believe I do see some cold shuts on the pics and believe this really is a forged pattern!
I also don't think that Leo Figiel would have mistaken a fake/etched pattern for the real thing...
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The “round“ structure which looks like a wheel or a half cut orange will be possible to make as a round bar, not impossible. But making opposite cuts and fold it out will not result such a clear, undeformed pattern with one round near the other. Cutting such a bar into slices and weld let me say 30 pieces side by side on a flat different steel is possible but the weld will not so good that you ca make a long enough bar to bend it round to make a barrel.
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The approach won't work as pictured - I think there is a step missing/implicated: First, the rod will need an additional layer of iron with the final cross-section being square (without distorting the circular core). Then you need to completely cut through the circular core but keep a thin outer layer for flattening out the zig-zag folds into a band. In the final configuration on the barrel, there also seems to be a slightly thicker interspersing "line" for fusing the spirally arranged pattern-welded band.
Regards,
Kai