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Originally Posted by Gt Obach
I second the sandwich billet for the top..
basically its a flat stack...forged out ... then the final shape is forge on the edge of the billet.... like turning a sandwich sideways so you can see whats in it.. lol
second one looks the same......but a thick shim (possibly high carb steel) was added to the top and bottom of the flat stack when forging out......
Greg
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I'm almost 100% sure that what Rsword meant by "sandwich" is what is (incorrectly from what I'm told) called "san mai" in USA; a full-width layer of edge steel welded between two full-width side plates of iron or lower carbon steel.
Otherwise, I basically agree. I don't think the edge bits were welded on before the final fold, as you propose, and I highly suspect they are pinced into the edge of the blade. Both blades show some sign of this.