Are These K.u.k.stamps? Need Catalog Numbers Please

Hello, I am not exactly sure what this document is as I haven't researched it yet. I do know it is an acknowledgement of receipt for something.It is a postal card with prepaid 10h postage and is franked with three stamps. Are these stamps K.U.K.stamps? It was sent to Elbeteinitz, Bohemia in 1911 so I know it wasstill part of the Austria-hungarian Empire. Anyway, will someone please give me the catalog numbere for these stamps.
Thank you
David

These stamps are Scott #122 (Franz Jozef on horseback)
Definitive set issued for the 60th year of the reign of Emperor Franz Josef and contains 18 stamps.

I have no idea what the brown things are, containing Wien 59.

Many thanks for the catalog numbers Scarah
David

Google Translate says wien 59 is Vienna 59. Does that make any sense to anyone? Possibly postal station in the capital?