The STEYR MANNLICHER SM12® 150 years STEYR MANNLICHER is an elegant piece of art, limited to 150 pcs. With our historical logos, the model name on the receiver and the serial number which is the same as the number of the rifle (1/150, 2/150,) encompassed with real gold inlays and a cold hammer [.]Read More. Steyr Mannlicher is a firearms manufacturer based in Steyr, Austria. Originally part of Steyr-Daimler-Puch, it became independent when the conglomerate was broken up.