Exactus Mini-add
Exactus Limited, London, England
dimensions...........10,5 x 7 x 0,4 cm
weight..................55 g
material................aluminium
digits ...................9 (5 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 large item (see next picture).