I have a 1908 Military First Issue which has some markings that are different from the ones listed in Harry Jones's Luger Variations book.The luger is in the 1500-2000 SN range,among the first lot of Lugers issued to the German military.I'll post some photos of the different markings and maybe someone can shed some light on them.
This first photo shows the underside of the rear toggle.The triangle within the circle is the same as the well markings on the 1902 Commercial and American Eagle,also the 1906 Commercial.
http://mediaservice.photoisland.com/...9543296785.jpg