Sven,
The stock lug and hold-open (just visible in first photo), indicate that it could be as early as later 1913 production (both changes in place by this serial #), unless it has the re-enforced rear frame and modified main spring housing implemented in later 1914 (need photos of these areas to tell). The visible machine marks on the toggle ears suggest, but do not prove, production 1915 to 1918 (more likely 1917-18). If the grips are serialized to the frame, are they walnut or beech? If they are beech then it would strongly indicate 1917 or 1918 production although some walnut grips were still used in 1917-18, and a few had beech grips in 1916.
KFS
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