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
Ketron Solton SD5 SD3 SD1 SD1+ X1 X4 XD3 XD9 Vega Floppy Disk Drive
Roland V Drums Hi Hat Trigger Pedal FD1 FD-1
