Thank you.
I noticed that tooths were slightly staggered, but opposite teeth looked symmetrical. Surfaces to touch up looked straight lands (facets?), not that complicated geometrically, but needs pretty controlled and repeatble depth stop (two settings and two angles).
I will not loose much money if I try to sharpen it one day. I ordered exactly same size, and then others fifferent brands, I better check them before and make some notes.
Pekka