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A couple of years ago I was browsing the computer displays at the Science and Technology Museum and spotted something rather familiar. It was a Hewlett Packard calculator; the same model as the one on my desk. It seems that my favourite calculator is actually two years older than I am.
After a bit of digging, I discovered that this calculator (which I bought for $5 at a garage sale) is not only historic, but is also a collector's item. The online Museum of HP Calculators lists its value at over $100.