I think Wayne may be correct about the blade...The posted sword and the LC 1796 sword shown together on the pictures posted by Wayne seem to be to scale. The LC blade is longer as it still has the tang....I believe on the posted sword the tang was removed....the forte re-worked so that slabs could be fitted.
Origins
really could be arabic or South American....at the moment I'm siding with South American. The LC 1796 was adopted by the Prussians,1811 pattern or "Blücher sabre" and used by Portuguese and Spanish cavalry.....
Regards David