Sword Production in Persia?

[B.I]

Hoping for some help with a specific question.
Is anyone aware of any primary sources, or quotes that refer to actual sword making in Persia.
It is not my field, and so my library doesnt cover anything in-depth. I am not interested in names or locations on blades, nor mentions in later books. What I am looking for is either direct evidence of a manafacturing centre for swords, or a quotation that states swords were made in a specific place (ie not Persia, but a district within).
A brief look through Al-Kindi and most the the blades were imported. He does mention Khorassan, and I wonder if anyone can provide more information that backs this up.
BTW, any period in Persian history, but preferable iron age onwards ie sword culture. Bronze foundaries is of related interest, but more medieval, rather than bronze age (ie art as apposed to arms)
I seem to recall some discussions that touched upon this (possibly starting from wootz exporting) but cant find anything that answers this question.