I have never seen a pecelike that, but I did buy an oddity not long ago that seems related. It was a French 10 gauge hammer single fowler that had a Damascus barrel that had a heavy octagon rear portion that stepped down at a wedding ring to a round lighter diameter. The barrel was Damascus but the thicker octagon section was twist. My guess was that it was a lighter damascus overlaid with twist during the welding to give the diameter needed for the octagon section. Odd.
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