Hi Stephen,
are there no markings at all ?
The fullers on the blade seem very 'square' ie the 'walls' look straight with no 'curve'...is that the case ? I don't recall a European blade having this feature (but my knowledge of these is 'limited'
). Hopefully Jim might be able to ID.
The sword looks to be well made so quite likely late 19th C or earlier. Nimcha, are still made today...but my understanding is that early 20th C onwards ...the quality deteriated.
How is the pommel fixed to the tang ?
Regards David