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?