The Olivetti Summa Prima 20 is a classic manual mechanical calculator, first introduced in 1960. Designed by Marcello Nizzoli with mechanical engineering by Natale Capellaro, it stands as an iconic piece of Italian industrial design. This hand-cranked calculator performs addition and subtraction and prints results on an integrated paper roll—perfect for collectors, vintage enthusiasts, or anyone who appreciates beautifully engineered office equipment. Key Features: • Fully functional manual mechanical operation (no electricity required) • Built-in printing function • Distinctive aqua-green design with rounded shapes • Compact and portable • Ideal for collectors or display Condition: Very good vintage condition. There is only a visible small crack on the left side, but the machine is fully functional and operates as intended.