More like £1,300!In my early days I worked for a company where the boss had an electronic calcuator he had bought in 1971. It was about the size of an A5 pad, but much deeper, had a rechargeable battery, and worked in a different way to the calaculators I was used to in the 80s (perhaps a ’register’ calculator? I can’t remember). Whatever, he told me on more than one occasion that it was £90 or so when he bought it in 1971. That’s getting on for £2k now…
HP had a calculator in 1972 (https://en.wikipedia.org/wiki/HP-35) which used reverse Polish notation which I continue to prefer today, but it’s clearly less “intuitive” to first-time users. It had earlier desktop calculators which also used RPN which I’m guessing you’re referring to. See https://www.hpmuseum.org/
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