Vintage Olivetti Summa Prima 20 Mechanical Adding Machine

Iconic Italian Mid-Century Design by Marcello Nizzoli — Made in Italy

Up for sale is a wonderful piece of mid-century office history: an original Olivetti Summa Prima 20 hand-cranked adding machine. Designed in 1960 by the renowned Italian designer Marcello Nizzoli, this mechanical calculator is celebrated globally for its beautiful industrial styling, tactile keyboard layout, and distinct gray and pink color scheme.

This mechanical desktop unit operates entirely on internal gears and levers via the large black-handled manual side crank, making it a marvelous engineering collectible or an eye-catching retro display piece for a studio, workshop, or home office shelf.

Key Specifications:

• Manufacturer: Olivetti

• Model: Summa Prima 20

• Designer: Marcello Nizzoli

• Origin: Made in Italy (Fabriqué en Italie)

• Mechanism: Manual hand-cranked mechanical operation (no power cord required)

• Media: Uses standard paper tally rolls (original vintage roll partial remains loaded)

Product Condition Report:

• Cosmetic Status: In good, clean vintage condition showing honest signs of age. The sturdy composite outer shell is free of deep cracks or structural breaks. The cream and black keycaps are clear and firmly seated. There is a small layer of typical internal dust and old lubricant scent inside the rear mechanical bay which is normal for office equipment of this age.

This heavy mechanical instrument is quite substantial and will be wrapped carefully in multiple thick layers of professional bubble wrap, then secured firmly inside a rigid cardboard shipping box with loose-fill cushioning to guarantee safe transit. Sent via fast, tracked delivery.