Here is my first kiridashi, which I got on my recent trip to Amsterdam. It's a Morihei Kikuyu White #2 18mm. It came with a factory edge and bevel, which wasn't too messed up, but still took me about an hour on diamond plates to bring it to the level I wanted. I took it further on 1K cerax, 3K Naniwa pro, 6K morihei. After that I have done some experiments with jnats. Tried a few Aiwatani nagura and kappa, Chu Nagura as well as Ozuku kappa all from JNS. Oh, that was fun ))).
The initial purpose was to use it as an expensive parcel opener, but once I have it I've used it to score sourdough dough during my last bake. It seems to do a great job at that. Also, I will use it for testing polishing stones and improving my technique, which I am pretty crap at to be honest.
The picture with the box is the original untouched version. The second picture is after spending a few minutes on Ozuku kappa with some slurry and very light pressure.