Remember when having a calculator on your wristwatch made you feel as if you were a member of Starfleet? Remember the crushing pain of having it confiscated by your maths teacher for cheating in class?
While your former teachers may not agree, it all seems primitive now, of course, what with today's watches taking phone calls, measuring heart rates and occasionally telling the time - but it was all a little different back in 1977.
Yes, 1977, the year HP created the world’s first calculator watch: the HP-01, and now the original prototype is being sold for £8,600, possibly catering as much to the discerning hipster as any high-end tech geeks…
It's available on eBay, but what price can you really put on a piece of tech history? Calculate that on your iPhone and get back to us.