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Gillette GPA / Sinclair Oxford 100

Gillette GPA
Sinclair Oxford 100

Gillette GPA.

Display is 8 digits, red LED.

4-function.

Type 1, sharp cornered case.

9v (PP3 battery).

73 x 155 x 34 mm (2.9 x 6.1 x 1.3 ins).

Made in England (by Sinclair).

Sinclair Oxford 100

Display is 8 digits, red LED.

Type 1, sharp cornered case.

4-function.

9v (PP3).

73 x 155 x 34 mm (2.9 x 6.1 x 1.3 ins).

Made in England.

The GPA was developed by Sinclair in late 1974 for Gillette, the razor company. It was a short-lived model but formed the basis for the Sinclair Oxford 100, the first of Sinclair's Oxford range, which was launched in Spring 1975.

The Gillette model has a slightly cruder plastic case. The moulding on the Sinclair Oxford is better and slightly more rounded. This has been designated Oxford case type 1 on this site, and is always coupled with an LED display.

Later calculators in the Oxford range had a more stylish, more rounded case, ususally coupled with a green VFD display. This has been designated Oxford case type 2 on this site and can be seen on the other Oxford pages.

Vintage Calculators

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