Produx Original — Vintage German Mechanical Pocket Calculator

Before the pocket calculator, there was the Produx Original — and it still works. This stunning little machine is a mid-century German mechanical slide adder, made in the 1950s and designed by Otto Meuter, a pioneer of the pocket calculator form. Built entirely of metal with red and gold detailing, it fits in your palm and performs addition and subtraction by sliding numbered tabs with the included stylus. Pull the handle to reset. No batteries. No apps. Just beautiful, satisfying precision. Comes complete with original green leatherette case and original stylus — a rare find as a full set.