Ibanez 1978. Musician MC500 in Dark Stain Finish.
Carved Top.
Neck Through Construction with Mahogany & Ash sandwich wings.
7-piece Maple & Walnut Neck with Ebony Fretboard.
Super 88 Humbuckers with no apparent pole pieces (1978 Model)
Master Volume and Tone Control.
Gain (EQ boost / cut) Control.
3-band EQ (bass, mid & treble).
Tri-Sound Switch for Coil Split or Reverse Phase & EQ on/off
#F787423 of June 1978.

This is a very interesting link on Wiki FanDom for the MC500