a definitive answer

Joined the NewtonianReflector group on Yahoo and asked questions about the "mystery" eyepiece from Mom's Edmund Sci. telescope. In short order, I received a couple of informative replies.

From Chuck:

It's a Kellner. I've owned a couple of them. Doesn't have a field stop, so it's really kind of hard to tell what the AFOV is. Lot's of pincushion, so Edmund may have been calling it a Kellner, when it was really something else?

From Bobby:

It is an Edmund 1.25 -1"FL Kellner, it has uncoated cemented lens and anodized alloy body with no markings and no field stop. It has an ultrawide field of view (maybe 75 deg) but the FOV at the edges are unclear because of the lack of a field stop. It's one of the better vintage eyepieces of the mid-60's to mid-70's. Was the original EP with my 6"/f8 Edmund and 4.25"/f10 reflector.

I can finally put this item to bed.