Casio 31QR-12 is an incredibly rare Casiotron 1976.

In great condition for its age

Produced in 1976

New battery and fully serviced with guarantee

 The Casio 31QR-12 is an incredibly rare, vintage digital watch released by Casio in 1976.

It represents the dawn of Casio's digital timekeeping history, arriving shortly after the legendary Casiotron line launched in 1974

• Early Era: This model was introduced when Casio transitioned from making calculators to pioneering mass-produced digital wristwear.
• Naming Conventions: The "31" in the model name indicates it uses Casio's internal qw31 module. The "QR" indicates it belongs to the high-end digital line-up of the mid-1970s, which shared internal components with Casiotron-branded models but featured distinctive tier finishing.
• Original Value: It originally retailed for roughly $89.00 USD in 1976, which was considered an expensive luxury purchase at the time

• Build: Solid all-stainless steel round case (approx. 34mm–35mm width, 9mm thickness) paired with a integrated metal bracelet and screw back case. 
• Display: A sharp, early-generation Liquid Crystal Display (LCD) screen shielded by mineral crystal. 
• Unique Timekeeping: The face prominently displays "Casio Quartz". Alongside hours and minutes, the screen utilizes a unique signature layout featuring a 10-second increment tracking segment and a small graphic star indicator to signify P.M. time. 

• Dual Modes: The watch alternates between basic timekeeping and a standalone native calendar.
• Stopwatch: Includes an early variant count-up digital chronograph stopwatch function.
• Backlight: Equipped with a small, built-in vintage internal micro-bulb incandescent light for low-light visibility.