Switzerland hasn’t changed the design of most of its coins in well over a century. The reverse (“tails”) of most Swiss coins today hasn’t changed since 1850 (compare this to this), and the obverse (“heads”) hasn’t changed since the 1880s (see above).
Some of these very old coins can still be found in everyday change. I lived in Switzerland from 2002 to 2006, and about once a year, I’d get a really old one. The oldest was this 1884 coin I got back in change one day buying stamps at the post office. The most unexpected was a 1906 coin, which I got from a vending machine.
Switzerland: a numismatics paradise.