The first set of scans is from Austria, before and during World War I. The top one has a postmark from 1916 and shows an Austrian military censor's handstamp (the boxed purple text just left of the stamp); the bottom one looks like it may have been mailed in 1910.
Personally I think you have a unique piece of personal history with these covers and cards. Most of them are addressed to the same person, and before/during the war she lived in Sudetenland, the Germanspeaking part of Czechoslovakia and after the war she lives in Munich. Most Germans were kicked out of Sudetenland, had to flee and many of them ended up in Bavaria.
Those small blue stamps are referred to as "Blue Fleas" because they were once considered a nuisance for the postal people to affix to covers and cards and they then got called "Blue Fleas". They are a specialty all on their own.
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