Hi,
As promised: These are the color pictures of the grips on a dutch frame # 2850:
The left side is the original DWM grip (1913). The other side is a GS (Geweermakersschool) replacement.
Both are stamped with the frame number (2850) and the GS grip has the GS mark added (no cartouche around the GS mark).
Backsides:
Frontsides:
Detail DWM serial number:
Detail GS serial number:
Have fun,
Gerben