Guten Tag aus Schweden! I have two covers, please see pictures, that are franked with 10 Kr porto. However, according to Dr. Karl Zengerle, there is no 10 kr postage, only 11 Kr and 9 Kr in this time (1870-1875). Please see scans. Can anybody help me with this, anyone that has some idea? You can write in German, I can read German but I write very bad. Ich kann Deutsch lesen, aber nicht schreiben.

And the second cover...