This 1942 ad for a comptometer is just perfect because first of all, I had no idea what a comptometer was (a mechanical calculator, basically) and second, the spec sheet is wonderful: no glare dials, elimination of non-essential zeroes, and a “Keystroke Censor.”
A man reconstructed the 2000 year old Antikythera Mechanism, an ancient “computer” built by the Greeks to keep track of the moon, the planets and cycles. It’s as amazing now as it was then.