Need help with translation of a " blasphemous"(?) inscription

[ariel]

Sold on E-Bay.
This is an Ethiopian sword with straight blade 27 1/4" long, total 32".
Was advertised as Mamluk blade.
I was intrigued by the inscriptions and asked several colleagues , native Arabic, Farsi and Urdu speakers to translate the inscriptions.
First " Arabic" person told me that it was not in Arabic.
Farsi and Urdu were similarly rejected.
But then, one of those colleagues sent pics to her friend, a Saudi Arabian guy, who told her that the only thing he could translate was "Oh Muhammed", and the rest was " blasphemous". That piqued my interest even more.
Apologize for the pic of the entire sword: that was taken when it was already sold and the pics could not be adjusted.

Asking general opinions and Kwiatek's help with translation.
Many thanks.