Casio MG-500 MIDI Electric Guitar - 1980s - Black | Reverb
Manual: MG500 OM CASIO EN : Free Download, Borrow, and Streaming : Internet Archive
Casio MG-500 MIDI Guitar Made in 1980s Used From Japan | eBay
Casio MG-510 midi guitar, made in Japan, ser. no. T0xxxx8, back finish with light surface imperfections, electrics in working order, soft case, condition: good
Casio MG-500 MIDI Guitar Made in 1980s Used From Japan | eBay