I first learned about the Curta from this January 2004 article in Scientific American, by Cliff Stoll. Unfortunately, the article is not available for free. But you can purchase a PDF of the whole Jan ...

I inherited my father’s Curta. Thankfully it comes in an o-ring sealed metal case, so it’s in mint condition. The only thing I’ve ever encountered made as well was a classic Zeiss microscope, also ...