flickr by Patrick Mimran
"Synthesizer System 'Le Bart' with a HP1000 Computer
Build for Patrick Mimran in 1980-1981"
No additional info at this point. I will post back if any comes in. You can find Patrick Mimran's YouTube Channel here.
Update: some info in via Frederic Gerchambeau who believes it was made in 1980 or 1981. (Google translated, original French further below):
