I noted five 5-fullered kaskaras in my Kaskara Fullers paper. One was collected in 1881-82 and mine was reported made in 1914 in Kassala. Five fullers are called Mukhammas.
From the paper"
"Mukhammas (Arabic ‘fivefold’) refers to a type of Persian or Urdu cinquain or
pentastich with Sufi connections based on a pentameter and have five lines in
each paragraph. More details here:
https://en.wikipedia.org/wiki/Mukhammas
Native and Arabic poetry is a feature of Sudanese culture. But who would have thought that a special Kassala-made sword blade (5 channels are much more difficult to make than 3 fullers) would have a link to a Persian and Urdu (Muslim part of India) poetry form? There may be a prosaic explanation. Mukhammas may be just a grammatic feature of Arabic for Five = Khamsa, but I
prefer the poetry connection."
Your blade may have had a Sudanese connection, and likely origin. Five fullers would make your blade special regardless of its origin.
Best,
Ed