Your Dreyse 6.35mm Model of 1907,was marketed by a company named Rheinmetall of Sommerda Germany, has a six shot magazine,weighs 14oz.,2" barrel, hard rubber grips with the "RMF" logo molded in.
The patent for the design was issued in 1909 to Louis Schmeisser. Values from 400$ in excellent, 250 very good 200 good,150 fair 100 poor.
All info gleaned from the pages of the 2008 STANDARD CATALOG OF FIREARMS 18th edition