Marcello Nizzoli, Natale Capellaro - Olivetti Summa 15 - Calculator - 1949 - Crank-operated printer for a mechanical calculating machine

Old Olivetti Summa 15 mechanical calculating machine, made in Italy. Iconic model introduced in 1949 and widely used in offices, shops, and government administrations during the 1950s. This printing calculator operates manually thanks to its large side crank and features a numeric keypad, a paper roll, and a central control allowing various calculation operations. The Summa 15 is notably known for its innovative mechanism developed by Natale Capellaro and its distinctive design reflecting post-war Italian industrial aesthetic. Beautiful vintage office machine, sturdy and decorative, showing signs of use and a patina appropriate to its age. Marked "Summa 15 Olivetti – Made in Italy / Fabriqué en Italie".

Highly sought after in the worlds of industrial design, scientific curiosities, vintage medical technology, laboratory optics, steampunk, and rare measuring instruments.
Ideal for collectors, industrial loft décor, cabinet of curiosities, scientific display case (theodolite, microscope, sextant, compass).