My grandma has an old Felix artithmometer. AFAIK these are capable of the same things as the Curta but with a less elegant and convenient form factor. It really shows why Curtas are so valuable.

Last time I visited her I used it to estimate sqrt(2) to 3 digits precision. (Result is on the left side https://imgur.com/a/CoEuC)

Also interesting to see previous mentions on HN

https://hn.algolia.com/?query=curta%20calculator&sort=byDate...

such as "Old Calculator Web Museum" | https://news.ycombinator.com/item?id=15821248

Also that Wikipedia page mentions that someone had made a Curta using a 3D printer but because it the low tolerance they had to make very big pieces.