i'm guessing a differentially heat treated 12C27 blade.
i'm also going with satin and inexpensive.
I can see the 12C27 as it's inexpensive (definitely fits the Scrapyard's ethos!). Is there a benefit to differential heat treating 12C27? I know that it's sometimes done to choppers or throwers but I don't think I've heard of it done to stainless. Just a thought.