Thanks for all the replies. I'm still in shock that this is a valuable sword. I see that Moses (Moises?) Becerra is a 2+ hour drive each way from me, but it would be worth the trip for a professional evaluation.
Gabriel, that is some sort of powder on the mei. I'm guessing that someone put it there at some point to make it easier to read. My father had taken the sword to someone many years ago, but I don't know what came of that. Now I wish I asked my father more about it.
Sorry for the quality of the photos. I just laid the sword on a bath towel, and the bits of the towel obscure the edge of the blade so it looks ugly. It looks much better in person.
Jacques, 2 million yen is US$19,000. Are you saying my sword could be worth that much? Perhaps if in perfect condition...
Thanks again, guys. And, no, I won't try to do anything to the sword.