Hi jadessway. It's an interesting piece… overtly, it's an example of Japanese naval mountings as used in WWII (and a bit before), but a rather ostentatious form of it (which is fairly unusual). I'd suggest it was most likely worn by someone of relatively high rank, and some funds… but the thing to understand about sword appraisal is that the fittings are the least of the entire equation… the blade itself is what matters. And, in your pictures, there is almost no sign of the blade at all. The small section that can be seen shows that there is a bo-hi (groove) present, but not much else… there's not much shown of the hamon, the grain isn't viewable, and more… which doesn't help.
In order to actually get a definitive answer, it'd help to get some good pictures of the blade itself, both very close up, and of the entire length (preferably taken out from the tsuka so the nakago can be inspected) on both sides. There'd need to be pictures of the kissaki (tip), any small chips or inconsistencies in the blade edge itself (ha), and detailed photos of the nakago (the tang, the part of the blade that extended inside the tsuka, the handle). The nakago is where we can tell the age (potentially, at least), as well as see any actual identifying marks, such as a mei (signature).
The most likely upshot, however, is that it's a gunto (military sword), likely an oil-cooled, mass-produced item of little actual value… but you never know. I don't know that I'd necessarily trust an antique dealer overtly to be able to appraise a nihonto, though… it's rather a specialised skill set, and most simply don't deal in enough to actually get the proper knowledge and experience in this field.