Casio SF-4000 digital diary organizer not working 1980s Japan

Vintage Casio SF-4000 Digital Diary Personal Assistant Calculator Untested

Casio SF-4000 Digital Diary Organizer Calculator Calendar Made in Japan Untested

Casio SF-4000 Digital Diary Organizer Calculator Calendar Japan w/ Manual Works!

Casio Digital Diary SF-4000 - Black Organiser. No Power. Spares Or Repair.

Vintage Casio Digital Diary SF-4100 32KB memory. Battery dead

Vintage 1980s Casio Digital Diary SF-4000 Working With New Batteries

Casio SF-4000 Digital Diary Organizer Calculator Calendar Made in Japan Untested