This is actually Landsturm.
It is a Probe piece.
Tag says:
Probe Trial/Test Piece
der Dienstmütze of the service cap
für Landsturm for Landsturm
Infanterie Infantry
Berlin, den 6. Mai 1878 Berlin, 6th of May 1878
Kriegs-Ministerium Ministry of War
Militaer Oekonomie Department Department of Military Economy
Abtheilung für die Bekleidungs-Angelegenheiten Clothing Affairs Section
Credit: Hans K
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