Sykes and Fairbain really new their stuff. S7 is what some of the worlds best custom katanas are made from. I have a hunch the reason Scrapyard knives are so tough is the heat treat is done so the S7 steel forms bainite.
I would like to see a tactical wakizashi from the yard. 15 inch blade and a 7 inch
handle. It should have a real convex edge. I have a cheness 9260 kat that is pretty tough but I would give the scrapper the edge. You also could not have a deadlier weapon in a confined space than a wak.