Wagon master, try to do a rubbing with a pencil and paper, I've had good luck doing that with coins to fax for ID.
Press paper on top of the engraving and rub the side of the pencil lead on top to get a good depiction and take a pic of that
She says (via her parents in Tokyo) that the first character Says: Noushu= Southern part of an area in Japan where a lot of sword makers still work. The last Characters are more likely the Smith's name or the store it smithed at.
Her folks also referred this website: http://www.nosyu-token.jp/
Not that you will know what the hell it says, haha! But that is the jist of what you have there, a real deal no BS non tourist attraction sword made of good ole Nippongen steel. Looking at the website she (my GF) translated that a sword by that name is running about $6,500-10,000 (As listed in the site).
Its hard to tell without looking it over and having some kind of knowledge of swords, but that at least, is the take on it from our little investigation.
This should steer you at least in a better direction.
Just to clarify, the first two character says "noshu", which is a southern area of Gifu prefecture, where there are still sword smithing and sword related stores, today. The last character can be read "gen" or "moto" and it may be a part of a name, but I can't make out the two characters before that so I can't tell. If you can get a better picture of the last 3 characters, I can find out more! But since no one can even guess, it might be that the sword is a replica, and some foreign person imitated the characters onto the sword. I may be wrong!