Question about stamping maker's marks

Joined
May 15, 2015
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I was watching Ray Mears' Bushcraft: Sweden, in which he visits a knife maker in Sweden and has a puukko blade made. The last thing the maker does, after heat treat and final grinding, is stamp the blade before handing it to Mears ([video=youtube;nR7N5zuC8WI]https://www.youtube.com/watch?v=nR7N5zuC8WI[/video] It's right at 28:00). From various posts here, my understanding was that this would ruin the stamp. So... what gives?
 
Swedish and puukko style blades are usually make with a hard core and softer plain iron sides. Often called a laminated blade. The soft side steel will stamp after HT.

I had a person watching me engrave my Japanese mark on a deba, and he asked how I could use a hand graver to cut such hard steel. As in the Swedish steel, the upper area of the blade is plain iron.
 
Oh... yep. Watched it again and that's just what he did. Went right past me the first time.
 
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