Up for sale is a fantastic slice of retro 1980s tech history—a vintage Casio Data-Cal 50 data storage pocket calculator (Model DC-750A). Made in Japan, this ultra-slim, credit-card-sized device was the ultimate mobile organizer of its era, boasting a 50-record telephone directory memory alongside its core mathematical features. Features the legendary "Secret" function key layout for locked memory protection, plus a crisp dual-line layout LCD display screen. Excellent addition for any collector of vintage computing, retro Casio tech, or pocket electronics. The Vintage 1989 Casio Data-Cal 50 Calculator DC-750A is a retro collectable, and features a unique data bank function and a card slot for storing information, making it a practical and stylish accessory for the era. Its vintage design adds a nostalgic touch to any collection, making it a sought-after item for those interested in retro technology and Japanese craftsmanship. Pre-owned vintage condition. The touch-membrane keypad and casing display very clean cosmetic shape with light handling scuffs from age. The battery compartment cover is intact. Fitted with a new CR2016 battery and fully tested. It powers up perfectly, all buttons respond smoothly, and the LCD display screen shows no fading or dead pixels!