it's a state eagle and used by Deutsche Reichspost, but also for forestry (Gemeindeforstbeamte and Reichsnährstand)
and for a short period of time customs (Zollbeamte), when it was replaced by a new pattern. Dt. Reichsbahn did wear this eagle
in golden color. Their drivers had the alu type of eagle.
The HY did wear also the SA type of eagle, but the stand for the head is then the other way around.
"Wir sollen auch unser Leben für die Brüder lassen" (1.Joh.3.16):
zum Gedächtnis Wilhelm Schenk. Er starb fürs Vaterland am 13. Juni 1916