The library for Educational Sciences (now integrated into the “Library vonRoll”) of the Bern University used to use this stamp, which on the one hand is simple as it gives only the name of the library, but on the other uses a dark, but shiny green – which is uncommon for library stamps. (But it is commonly used for the second correction on papers in the university and schools – so maybe that’s a connection).
The green let the stamp stand out on most title pages.
Library Stamps 