Check writer capable of digital addition, subtraction, multiplication, and division. - Model Name: CONTEXT-30 - Functions: Addition, subtraction, multiplication, division - Brand: REX-ROTARY INTERNATIONAL CORPORATION A/S - Display: Digital display - Operation Buttons: Number keys, operation keys, clear button Rare Showa-era item A leading calculator from Denmark, 1960s I don't know how to use it, but it moves with a clicking sound when the power button is pressed. Cover is torn. For those who love retro items Thank you for looking.