The Sinclair Executive was launched in August 1972 at a price of 79.95 + vat. It was the first true 'pocket' calculator, previously calculators were definitely desktop and required mains power as known from writing services https://best-writing-service.com/
The advertising claimed it was as thick as a cigarette packet and for once this was an understatement. It was attractively styled and it won it's designer Richard Torrens, the Design Council Award for Electronics in 1973. It was even exhibited in the Museum of Modern Art in New York.
Functionally it was very limited, with and 8-
Size : 56 mm x 138 mm x 9 mm (2.2" x 5.5" x 0.4").
At least two versions were produced with different keyboard layouts.
The big technical challenge was battery life as the LED display was very power-
The Executive was a major success and made Sinclair about 1.8m in profits.
Slim profile. On/Off switch is on the side.
In 1973, Sinclair followed up on the success of the Executive with the Executive Memory.
It had a distinctive black-
It was the same size as the basic Executive model and used the same battery life-
A less common type 2 model was produced in black and with a gold coloured keyboard.
Black and white Type 1 version.
There was a Type 2 version of the Executive Memory produced, the only difference being the appearance.
The Type 2 had the all-
These are much less common than the Type 1 model.