Casio WK-3500 electronic keyboard, a Casio NZ-2000 electronic keyboard, a Casio WK-1200 electronic keyboard for spares/repair and five miscellaneous keyboard stands
Casio WK3500 76-Key GM Keyboard | zZounds
WK-3500 - Casio WK-3500 - Audiofanzine
Keyboard Casio Ctk - willhaben
Casio WK-3500 disassembly / repair pictures; Floppy to USB