Oberheim OB-X Analog Synthesizer - Full 8 Voices - Pro Serviced Rev 1 - Block Face

via this auction, also on Reverb.

"ULTRA RARE Oberheim OBX 8 Voice, Revision 1 (Blockface OBX logo)

Originally a 6-voice, all 8 voice cards are functional and pass auto-tune.

You will not see a 100% fully functional Rev 1.0 in such pristine condition, possibly ever! Pro-serviced in 2017 by master tech Greg Montalbano of Analog Synth Service (Oakland, CA). Service included full calibration."

Pic of the inside below.