This video shows the vintage Eminent 310 Unique organ in action.

Pretty much instant Jarre – this is the organ heard on Oxygene.

via AnalogAudio1:

The Eminent 310U was the first organ featuring an electronic string ensemble. It is a great instrument – even so in 1972, when it came out. An analog reverb is built in, also a leslie / chorus, which can add life to the sounds. Addtional effects were not used in this video (except the introducing music with Small Stone pedal and delay to obtain the Oxygene-Sound). The best on the Eminent is the STRINGS ENSEMBLE, which produces the best synth-strings I ever heard.