A mid-20th-century mechanical pinwheel calculator, identified as the ADM Teacher model. This manual desktop device was distributed by Archimedes Diehl Machine Ltd. (ADM) of London and manufactured in Rastatt, West Germany, by Schubert. The machine features a die-cast metal housing with a light green hammered-effect enamel finish. It is equipped with green plastic input levers and control knobs, alongside a manual side crank fitted with a dark wood or composite handle. The front of the upper casing is marked ADM TEACHER. The base section features a sliding carriage with counter and result registers. An identification plate on the rear is stamped with the location RASTATT, the reference DRV 160239, and the origin Made in Western-Germany. This specific model was marketed for educational use in the United Kingdom to demonstrate mechanical computation.
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