Hi Ed, the term "Nara-men" is used for a certain kind of mask, originally made from the Haruta school of armorers in workshops at the Nara region. They were made in a sort of serial production of almost the same shape. Usually featuring a detachable nose piece, a mustache, teeth and a goatee. All are ressei-men. As far as I know, they were also distributed as blanks for other workshops (or assemblers), so they could be adepted to the taste of a customer or an ongoing armor project. I'm sure others here knowing much more about the subject.
BTW, I agree with Frederic and Dave (kaga tare, not original but goes well with the mask) Nice!
The menpo from the catalogue you reference is from the Iwai school and it does share a similar expression and styling to yours, except for the fact that the one from the catalogue is in iron and has yasurime (the fine lines engraved into the surface of the iron). The Iwai were also known to work with leather so that also would be another checkpoint for the attribution of your mask.