Mike, Here are a few general observations: DWM & early Mauser military PO8 grips are stamped with the last 2 digits of the serial using 3mm high dies. DWM commericals after WW1 and some early Mauser militaries & commericahls, will have unnumbered grips. Erfurt & Simson grips are thicker and will be proofed inside in addition to the small digits. Later Mauser WW2 era grips will most often be numbered with a much larger die set. Sometimes only one side is numbered and the other side will have an inspector's WaA. There's a much greater variation of grip numbering on these WW2 grips. TH
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