http://www.youtube.com/view_play_list?p=9AA9DD8A001675B7
This series of videos, by Marc Doty, takes a look at the Realistic MG-1 Synthesizer – a vintage analog synthesizer that was distributed by Radio Shack under their “Realistic” brand name.
Arguably a Moog synthesizer, it was a very odd synth – part monophonic, part polyphonic. But it was capable of great sounds, as Doty demonstrates.
See this post on the Moog Realistic MG-1 Synthesizer for some information on the history of the MG-1.