Exactus Mini-add
Exactus Limited, London, England
dimensions...........16 x 12 x 0,5 cm
weight..................275 g
material................aluminium
digits ...................10 (6 pounds, 2 shillings, 1 pence, 1 quarter pence)
single sided
including a pencil
There is a metal grooved plate that flips from addition to subtraction.
There is also a small item (see previous picture).