The Signature Junior Adding and Multiplying Machine

[@GrumpyTim]

That's quite an impressive thing for a "toy" or at least an entry level junior product. Apart from the non latching keys it's really good, well possibly it's a bit noisy when operating too. That's a great little find.

[@jaapsch2]

It cost $10 at the time, which is equivalent to about $80 in today's money. The failing latching is probably due to some corrosion on the inside, so it probably worked fine when new.

[@GrumpyTim]

@@jaapsch2 I'm sure it would have worked perfectly when it was new - that would have been quite a cool present to receive as a kid - I'm sure it would have got me more interested in maths than I was at the time. There's something fascinating about watching mechanical calculators and adding machines do their thing.