From what I can tell from the pics is that it looks like regular pitting, the cause of it could be from anything. I have a #12 Wapak that was/is pitted, but it was a good deal. the pitting is almost gone from years of use. Just my 2 cents.
---------- Post added at 01:40 PM ---------- Previous post was at 01:39 PM ----------
Oh yeah, and DONT task a grinder to it.