Hello Stephen,
Thank you for the welcome to the world of Nihonto. Yes, it is an unknown world to me, unlike anything that applies to edged pieces I already have, like a Revolutionary War hanger, Black Sea Yataghan, an Africian throwing sword, and such.
Whether this blade is worth a polish, well, that is what I am trying to learn and one of the reasons why I'm here - this board, with its wealth of information and wisdom, is part of my learning process. Should the blade be worth it, it will get one.
I'm afraid I don't necessarily agree that spending the time on just shows and going around seeing what other blades look like in polish, alone, is good reason or way to decide whether this blade would look good in a polish and, around here, would be lacking any useful information in trying to understand and learn about the blade(s). Seeing other blades, though, is always interesting, at least. Unfortunately, I know most of the dealers and participants of the arms shows around here and have little trust in any of them. I think I will seek more reputible avenues of research.
Frankly, this may well be the only Nihonto I ever will own. I will enjoy it, as is or polished, however, in my opinion, having possession of it bestows upon me the obligation of being a responsible conservator. Ergo, I try to learn.
Thank you, again, for your welcome.