Nice looking sword, definitely koto, Muromachi or before perhaps, to me....it looks to have seen some use in combat, judging by the damage in the monouchi area. A trained polisher should judge whether it can be repaired without significantly changing the shape.
Tough crowd! We do support preservation, right? It would not be cool if it got sold to some guy who was going to turn it into a Bowie knife. Some of us had to start at the bottom; this blade may be the bottom, but it would be a start. It may not have much up potential, but.....
Kind of rough, isn't it? Still, the price is low; with the savings, a polish or window may be helpful. I do not think everything is original to the blade. Some remainder of possibly takanoha yasurimei may point to older Mino work, and i can see an indication of notare or gunome hamon remaining.
Not to defend gimei, but one thing I do not hear discussed is how physical changes in the body are reflected in the appearance of work, such as the effects of arthritis in the hands, etc. My hands can feel like stuffed sausages after an intense session in the shop; I can imagine this could have had effects on mei, and we would probably not have anything documenting the fact.
I know you are new to all this terminology, but I hope it is going to better than a "trained sharpener" as that is not how swords are polished. The mei, or signature, as well as the actual features of the blade are how the various generations of smiths using a name are determined. There are also a lot of gimei, or fake signatures on swords, even old ones like yours.
The photos do not look promising, tourist item, or not great reproduction? Hamachi can move up, but down is not possible; carving is crude, in wrong places, and koshirae crude. More informed opinions will be along soon, I am sure.....Please post your other items.
I do not think nihonto are an investment other than in time and money which rarely yields a good financial return, as many sell at less than their cost! Even so, we love them, but there are better ones to be had than the one you show, even at modest cost.
You don't say the price, but it is not in polish, and does not look to be any kind of treasure.....You would perhaps be better off buying from a trusted member here; check the sales section.
Ken Hawaii sells the ZCorr bags; I see no problem using a hair dryer on the blade to remove excess humidity from the blade and open the pores to let oil in.
Despite what I could say on the topic, i will limit myself to warning that modern adhesives can severely damage blades through corrosion due to fumes etc that they give off; some research on bladesmithing sites have discussion of this.