via this auction
Interesting seeing it lined up with the GR-500 guitar synth.
Some details from the listing:
"This vintage System 102 Expander is a "one of a kind" time capsule from 1978.
I got it from the original owner who bought it in 1978 together with a GR500 Guitarsynth which is shown in the pictures. He used the GR500 for one project and put it into storage since then. The original 1978 System 100/102 Expander which he never used was never played before I got it! I still have the original boxes from '78. The System 102 is completely New Old Stock (NOS) and never been used before. It also works like a brand-new unit. It looks and sounds amazing and has zero issues. It is as reliable as a modern synth. This is a super rare find that's why the prize is a little above average but you will probably never find one in this condition again.
The System 100 is a great and classic analog synth! It's a beautiful semi-modular monophonic synth consisting of 5 module components: the Synthesizer 101, Expander 102, Mixer 103, Sequencer 104, and Monitor Speakers 109. The Synthesizer 101 section is the heart of the system, from which you could add-on any of the other modules of your choice. Different combinations of these components can be used to create systems of varying potential.The Expander 102 section is a keyboard-less version of the 101, designed to stand upright and behind the main Synthesizer 101. More than one Expander 102 can be added to make your system fatter and fatter! The Expander is identical to the Synthesizer except that it replaces Portamento/Glide effects with a Sample-and-Hold feature for the LFO, the Noise gen. is replaced by a Ring Modulator, and the A-440 tuning osc. is replaced by weak/strong sync inputs and a mix-in jack. The Expander is an excellent way to add more oscillators and synth effects (the s&h and ring-mod) to a System 100. The oscillators can be synced if you have both modules. The 101 & 102 are already internally patched and ready to produce sounds, but that can be bypassed by external patching."
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