If you do a partial disassembly, check the parts for the presence of a GS marking. Many parts that were made locally in Indonesia by the Dutch army maintenance crew were marked with this 'GS' (for GeweermakersSchool) marking. Since the grip on the right is coarser than the one on the left, I suspect it will have a GS marking on the inside.
Attached is a photo of the sear bar on my Dutch KNIL luger with the D GS inscription.
Forgot to mention that the Dutch magazines come in several guises, normally completely unmarked:
-Nickle tube with wooden bottom and small retaining spring to keep the bottom piece in place.
-Nickle tube with wooden bottom and no retaining spring.
-Blued tube with wooden bottom and no retaining spring.
-Blued Haenel-Schmeisser marked tube with alu bottom.
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