Curta Type I. It's a pocket calculator! :eng101:
An incredibly cool device that I feel really happy with owning. Sorry about blocking the thing with my hands all the time in this video, but it is incredibly difficult to demo this little thing without getting all up in your face about it.
Tags: Curta Type I, curta, type I, Contina, Curt Herzstark, Mechanical calculator, Vintage, Arithmetic, Adding machine