Looks like a rare solton accessory.
SOLTON Ketron FD1 Floppy Disc Drive with Power Supply Tested Works
Floppy Disc for Yamaha Electrone HS Organ - Registrations Organ Sounds
Floppy Disc for Yamaha Electrone HS Organ - By Popular Request Vol. 1
Floppy Disc for Yamaha Electrone HE Organ - HE Series Sounds Big Band Volume 1
Vintage Solton MS5 Keyboard– Multi Synthesis Arranger – Made in Italy – SN 6457
Solton (Ketron) Programmer 24 and 24S side panel screws
