Posted this in the eyepiece forum and so far nada ...
Found this eyepiece while sorting out my Astronomy stuff, can't remember when I got it ... possibly at the Stellafane swap table a few years back.
In any case it has a AFOV of around 65 degrees and its between 20 to 25 mm f/l (by my estimates), has the Japan/Circle T mark
I am thinking early Erfle ... maybe a Meade ?
Has anyone seen something similar so we can id ?