I've had this for ages and can't even remember where it came from. It comes in a cardboard pocket which you see here:
And slides out the side.
It opens like a little notebook to reveal...
This very fascinating face.
A stylus sits in a side pocket.
And is used in these slots.
Like here where I started where the 5 is and pushed down. And now 5 shows up at the top row.
To clear all the numbers this bar slides up.
And this is printed on the side.
It seems quite simple...and yet I can't figure out how to make it work as an "adding machine." Of course I'm rubbish at anything even remotely mathematically related so that could explain a lot...
But it's kinda neat, right? I like it anyway.