was talking with Ethan yesterday as it turns out, good 440A, well heat treated is a dandy steel...
in actual use, it's really hard to determine any appreciable differences... so it really doesn't matter
my thoughts:
the blade is not coated, much like the BK-77, so PROBABLY they looked at materials that would not corrode so easily. both of these knives are made of a type of stainless. for the BK-13, exotic steel would be pricey, and really not necessary, yah?
it's also the only hollow ground Becker i can think of. also has a bead blasted texture (on the usa made model), which makes it more fun.
easy care, easy sharpen, good price point.
the BK11-CSM has a different hide as well.
the BK13 also sells pretty well, so hopefully as a proof of concept they'll do more change ups :>