It doesn't affect the use of the keyboard in any way, is purely aesthetic and not really particularly noticeable (we like to call them 'battle scars').
Boss OD2 Turbo Overdrive Pedal Vintage 1988 MIJ Black Label Made In Japan Model
Vintage 1988 Epiphone SQ-180 Everly Brothers Acoustic Guitar – Ebony Black
Rare Vintage 1983 Casio Casiotone 610 Electronic Musical Keyboard METAL Working
Vintage 1980s Casio Casiotone Ct-320 Keyboard Synthesizer Drum Machine
Vintage 1980s Casio PT-1 Keyboard – Powers On – Distorted – Boxed – For Repair
Vintage 1983 Casio VL-1 VL-Tone Working Boxed Bright White Superb Condition