While my father-in-law was working his way through graduate school, he worked in a machine shop, and, yep, this knife (for him) began as a file that he used.
It is a 6.5" petty with a a crazy piece of coffee bag laminate. The other side has a little bit of blue on the heel.
I worked the grind angle nearly to zero and convexed the edge just a bit. The steel specced out at Rockwell 62. In layman's terms, this knife will cut really well and not require much sharpening at all.
Proud of this one.