[3] Whilst the GPA was released, Gillette put the product on hold after a short time due to economic and pricing uncertainties.

[3] The first model was the Oxford 100, launched in Spring 1975 for £12.95 (all prices exclude VAT); and essentially the same as the GPA.

[3][4] Both the Gillette GPA and Oxford 100 models used 8 digit displays with red light-emitting diodes (LEDs), 4 functions, 9 volt PP3 batteries, and measured 73 by 155 by 34 millimetres (2.9 in × 6.1 in × 1.3 in).

[3] The Oxford 300 was a scientific model with a limited number of functions (such as sin, cos, tan), which sold for £29.95, much lower than the competition.

Computer Digest recommended using a much larger PP9 battery, but that meant losing the portability of the calculator.