Hi,
Hirtenberg can be found in Austria. An ammunition producer called 'Otto Eberhardt' was located there and it seems the company was impounded as a result of Jewish ownership. Many companies that were confiscated were placed in the hands of the 'Gustloff Stiftung'.
So production should be somewhere between 1934 and 1945, most probably after the annexation of Austria, so the 1938-1945 timeframe.
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