A very simple stamp from the BFH Technik und Informatik (University of Applied Science of Berne for engineering and informatics) in Biel / Bienne (Switzerland). But note: Biel / Bienne is a bilinguale town (German / French), so the stamp is also in both languages.
On the other hand it is strange to see the pencil mark much better than the stamp.
And yes, a borrow slip which is still in use. Nice little feature.