Why not a rough edge, on a straight blade???
I use a file, Or a med grit stone, on my Zwickeys & Razorheads all the time. They are SHARP!!! I have accidently cut myself many times over the years,to attest to that,LMAO I have found the a perfectly smooth,"razor edge" quickly becomes dull...
I sharpen my heads 1 stroke to a side,alternating back & forth, to keep the edge balanced. There is always a very tiny "burr" on the edge, but it is VERY SHARP!!!!!
Maybe is this day & age we'd call it...
"Micro-Serrations" ???