The flag pin shows the German national flag. The black & yellow flag is the city of Munchen. The lower pendant is the Hungarian (Crown of Saint Stephen). Nice collection
@@kennethreese4659 The black and yellow flag doesn't mark the city of Munich in this case, it marks the "Habsburg" house or Austro-Hungaria as an ally. The pin therefore might have been used by Hungarians to demonstrate participation in the war efforts. The brooch is a brooch, probably for a women, made from a grenade casing. Such things were produced in the trenches by soldiers during free time.
