This is an Elka 707 Organ which is the cabinet version of the Elka x705 as used by Jean Michel Jarre. It's a very advanced organ (or it was in the late 1970s)
"Both the Elka Artist 707 and the portable version X-705 are fantastic sounding, entirely analogue dual manual organs from the late 70's. Featuring a very good (for the time) Hammond clone, 2 Elka Rhapsody 610 string machines, an Elka Soloist 505 monophonic synthesizer, a punch brass preset synth, a retro style beatbox and nice sounding spring reverb. A huge beast of a synth and great fun to play!
2- speed Leslie speaker built in. Complete with Bass Pedals & Swell Pedal
Not all sections are working now but it's still very playable with fab organ, string, piano sounds and others. Cost many thousands of pounds when new.
It's still great as it is but if any electronics expert wants to have it I have a full set of circuit and layout diagrams so it can be brought up to it's full potential.