Check the listing for details. Vintage Mechanical Calculator - Bell Punch "PLUS" (Model 509/C). Condition: Used, Made in Italy. Listed at 128.28 USD. magnificent mechanical calculating machine from the famous Bell Punch Company Ltd (London, England), marketed under the PLUS brand. This "key-driven" model is a true gem of British engineering from the 1950s/60s. Unlike the more imposing models, this one is compact and elegant with its industrial design typical of the period. • Functional: The machine is in working order. The keys respond well and the numbers increment correctly in the display window. • Aesthetics: Very good state of conservation. The beige shell and two-tone accents (gray and cream) are clean. • Authenticity: Complete identification plate under the base with serial number (509/C/877.937) and international patents. Ideal for a collector of vintage office objects, a lover of industrial design or for a retro and original off.