Just to nit-pick first, "Stereo Opticon" is not a preferred term. I
think you mean "stereoscope." As a "stereopticon" was a dual or triple
magic lantern, a "stereopticon viewer" would probably denote a person
inspecting such a beast! Anyway, I have an old issue of "Stereo World"
in my office with an ad for reproduction stereoscopes from T.M. Visual
Industries, Inc., in New York, phone 800-223-6694. I don't know anything
about them, but you might try calling. Tonight I'll check my more recent
issues of the magazine to see if there's a more current listing. --David
Haberstich