Ethiopian saber - request for blade ID and supplier

[Martin Lubojacky]

Hello,
Enclosed please find photos of relatively ordinary saber.
Please, does anybody know anything about NH + Son (fils) supplier ?
Where does the blade come from ? I think it could be end of 18th century (?). (There is strange double groove at the end of the blade ...)
Could you appoint coat-of-arms (one-head eagle with the cross on the chest) ?
I cannot read properly the inscriptions. Are they significant for the allocation ? ("Blahmann ???, Solong...or Solingen ???)
All parts of the sabre were used a lot, it visible both om the handle and the blade.

Thanks for help.
Martin