Sword ID Request

So the story here is that circa 2005 I was in England, and visited the Hadrian's Wall museum. I hadn't ever bought a sword before, but in the gift shop I saw this one mounted high on the wall. I bought it, and brought it back home in my checked luggage. I believe it was about £300 at the time. The gentleman in the shop told me it was from Spain, and that it was the "Sword of Julius Caesar". Ever since it has adorned my various mantles. At one point, I went to a tack shop (where you buy accessories for horses), and bought the leather strap you see, which is actually perfect for wearing it. I suspect it's not actually stainless steel, because it has a thick layer of grease or maybe even poly on to protect it, and the reflections have a sort of flake pattern, (maybe cast?). That tang is also pretty thin, so I'm pretty sure it's just meant to be a wallhanger. It came unsharpened. The furniture is pretty much all pure cast brass, I believe, and the "leather" is probably synthetic (or at least very papery!). It has the typical screw on pommel, which gets loose over time, and you have to keep tightening it. I love the look of it, so I'm ok with all that, just would like to know a bit more about it. I suspect Marto, but I haven't seen any Marto swords exactly like it online, and there's no markings whatsoever anywhere on the sword. Thanks to anyone who has more info on it!