Vintage British Calculators


Exactus Business Machines

Exactus calculator

Exactus Mini-Add

"Addiator"-type Sterling currency calculator, with capacity of £99,999 19s 11 d.

178 x 121 mm. / 7 x 4.75".

Made in England by Exactus Business Machines, 2/3Victoria Chambers, Luke Street, London EC2.

Probably made in 1950s to 1960s.

The Exactus Mini-Add is unusual in that a flap is flipped across to change from addition mode to subtraction mode.

Exactus in wallet

Exactus Mini-Add in wallet with box and instructions.

Vintage British Calculators

Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.