Hayduke,
The Busse family of knives (Busse Combat knife Co., Swamp Rat Knife Works, and Scrap Yard Knife Co.) are all located in the same shop in wasssuen(sp?)OH.
I imagine they all receive a similar heat treat, but may not the same as INFI, 52-100 and S7 are all different steels with different cooking times and temps for opium performance.
Most (if not all I think but I could be wrong) of the Scrapyard knives, including your new Scrapper 6, have through hardened with no temper line, perhaps S7 doesn't need/benefit from it? but the 52-100 Ratwiler (super sexy knife by the way) apparently gets more performance out of it.