Once every few years or so, I notice my 50+ year old Curta calculator on the shelf, still working like new, and marvel at what an absolute mechanical wonder it is. 
Liechtenstein has been all but forgotten as a center of mechanical computation.
I was born a generation or so too late to have direct daily experience with mechanical calculators, though my mom’s first job was as a “Comptometer Operator” in a large business.
Apparently Curtas are still the calculator of choice if you want to compete in a road rally old-school style.
One curious thing you might notice from the photo: the storage case is reverse threaded. Why? The crank only turns clockwise, and this way you can still get it open without damage if the handle gets stuck against the lid. They thought of everything!
