
via this auction
Update via Georg in the comments: "This is the B30 Microsynth from a company called CLEF PRODUCTS LIMITED from Bramhall, UK. It was sold as a kit as well in 1982.
I first thought the design looks like an BME, but I was wrong...
Georg."
Update via Hodgheg in the comments: "I used to sell these! Clef Products was a seriously weird place to work, I was there in the early 80's & left before they went bust. The Microsynth was the only instrument not designed in house; the designer was Allan Bradford MSc, at the time a lecturer in electronics at B'ham Uni. Good synth for the money, (£129 in kit form, £199 built) amazing variety of sounds but 1/3rd volt per octave meant tuning problems so bad that we used to put silica gel in the demo model to keep the humidity stable! I sold 30 bare pcb's to GCHQ (the listening spies) who wanted them for 30 new apprentices, presumably to teach them about soldering and/or interaction of waveforms. So I imagine somewhere there are a few Microsynths that stay in tune due to using military grade components:-)
If anyone wants to sell me one, contact me at hodgheg hotmail.com"