Eh, I'm bored so I'll take a stab at this. (Harhar.)
It looks very much like a cheap fantasy sword or katana. Everything from the weird fittings to the strangely bare hilt pretty much screams it. I almost think I've seen the same model before.
The only thing catching my eye that might say otherwise is the fact that the blade looks corroded or rusty. Most cheap pieces of junk are made from stainless steel and therefore should not rust. Please confirm whether or not this is due to the picture or simply dirt and use.
Also, where did you get it? Can you tell how the hilt is constructed? These details will help people identify it.
Anyway, if it is a modern fantasy sword (and I think it is), it looks like a higher-quality one. Perhaps $75 instead of $20.
Disclaimer: The above is merely my opinion. Someone may come on and tell you that you have a rare 18th century Vietnamese sword... but I doubt it.
Edit: I found it: http://getasword.com/1145-dragon-katana-wooden-handle.html
As sold at this site it is a mere $59 stainless steel wallhanger. Sorry about that. You probably wanted to hear about it being a Samurai General's katana or something.
It's still something interesting, just don't go around cutting up stuff with it, because being stainless it's likely to break (as opposed to high carbon tempered steel).