Braun ET-66 Calculator
The designs of Braun's "golden age," the period from the 1960s to the 1990s under the creative direction of Dieter Rams, have received renewed interest in recent years, due in no small part to the influence of Rams on the design aesthetic of Jonathan Ive for Apple.
This calculator design from 1987 was the basis for the original iOS calculator app. It features convex buttons, an 8 digit operating capacity and auto-off. It measures 3.25" wide x 5.5" long and has a sliding cover