This is not really a stamp, but you seem to see this more and more: Labels instead of stamps. Or: above stamps. (The label seem to be put on the stamp when the book became deposited into the depot (Magazin).)
The label seems crowed because everything have to be on there: Name of the Institution (University of apllied science nord-east switzerland, university of education), library (Libraries of the universities of education), the name of the depot (Depot Solothurn).
This stamp (on the same book) states Department of Languages.