This one popped up on a Swiss auction site ricardo.ch.
Apparently this was a one off system built by a Mr. Thoma, one of the pioneers in the Swiss experimental-electronical scene around Zurich in the late 70s / early 80s. You can find his site here: www.sounddesign.ch. TMS stands for Thoma Music System. It is listed on his equipment page here. The TMS is a Serge Modular clone he built for himself, however he did build some on request. He also has a Serge Modular. You can see it in a video further below. Unfortunately there isn't a video for the TMS on his YouTube channel.
This is one of those fascinating bits of synth history that hasn't been featured on the site before now. You never know what will come up.
