For the sake of science, I took it apart. That wasn't so easy, by the way. The tiny piece of leather I'd cut broke off immediately; it was bone dry. The peg was rock solid and split in half after a little persuasion on my part.
After removing the peg, it turned out the tsuka wouldn't come loose because someone had poured glue into it at some point. So, unfortunately, some brute force was needed there as well.
The tang isn't marked. It does have two parallel notches on the spine.
The tsuba is very rough on the blade side and completely unfinished.
The mark appears to be the same as the one Bruce has already shown, which is also on the tsuba of the other sword.