That makes as much sense as this kantei with one photograph, or the JP kantei by description, but at least it is fun. So let's do it.
Uwe, this is not a critique of your effort. Your pics are great, the threads are fun, but let us not fool ourselves that this has something to do with studying swords. This is just fun and should be treated as such.
OK, I know, I am a pompous bore
John, I just thought about a sword. Late Kamakura. Now you guess what it was.