<https://www.lugerforums.com/threads/bavarian-steyr-m12-w-1920-stamp.300/>
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"I report Steyr M12, first Bavarian contract, 1916, SN 8148, with 1920 on slide."
<https://www.lugerforums.com/threads/bavarian-steyr-m12-w-1920-stamp.300/>