The bead you show fits all of my criteria fo an "older" bead.
The glass has devitrified somewhat giving it a rough feel and look.
I love the way the design gets carried over on to the back of the bead, a true sign of higher craftsmanship! The smaller size is also way cool! Small triangles are very hard to find.
All in all this is a very nice bead and in it's heyday would have been a top quality Kiffa/Murakad. The surface texture is it's only detraction.
Thomas