A person very close to me send me yesterday this wonderful library related stamp issue from Sweden. Issue date was september 22nd 1961 on the occasion of the 300th anniversary of the swedish legal deposit act. It comes in three versions: 1st is the one to 20 Öre in carmine in two variations in perforation (perpendicular and three sided). The one I show in my online-collection ist the perpendicular one.
The third version is the ultramarin stamp on 1 Kroner.
The design was realized by K. E. Forsberg, the gravure by Czeslaw Slania.