1906/1915 DWM sn 29 p.28 Central Powers Pistols unit marked G.F.M.6.8 w/ matching mag.  Initially a Germand test Luger by Machine Gun unit G.F.M.G.8.  This was one of the top German combat units.  In spite of the East german rework after WWII, this is an very rare Imperial Military Luger.  No doubt this pistol saw action in both wars.  Remarkable.