Glad you got that sorted Norman
Nice sword.
I have a bayonet with similar script Jim, Ill take a photo, I belive my bayonet is inscribed in a form of Dari.
Heres the scribed form of it although mine is inscibed in a squarer more angular fashion.
Not certan but this sword inscription reminds me of some of it.
I have noticed Afghan swords have that rivet as well although I dont know howe common it was elswhere.
Spiral