The Kantonsbibliothek Graubünden (cantonal library of the canton of grison) is a hybrid institution. On the one hand the library has the function of a national library on the level of the canton (state) of Grison. On the other hand it has the fuction of a public library tailored to academic and semi-academic work.
The stamp itself is as simple as possible. Note the “GR” on the below of the stamp. It is common in Switzerland to abbreviate the name of the cantons with to letters. In the case of Grison it is also a way to include all three of the languages spoken in the canton (German, Italian, Rumosch) as the name of the canton in every of those languages could be abbreviate with GR.