its done with a laser i'm pretty sure.
i really think the busse combat,swamprat & scrapyard logos are really cool but i also dig a totally blank sterile blade.it kind of lets the quality and feel speak for itself without having to get into marketing.
i think the days of CG scrapyard knives coming without the logo are gone.i suspect all future scrapyard knives to have the logo on them.
dont know much about rollmarking myself but i do know scrapyard will do whatever makes the knife be all it can be just like if it where in the army and while keeping it all affordable.
i have faith in dans knowledge of CG knives and knives in general and it rollmarking was the best way to go he would do it.