Paul, I saw the talk again on Commercially proofed and serial numbered G 98 and have some comments on this.
First, all G 98 were Ring dated along with WFM name. In some cases older Gew 98 receivers had the dates scrubbed off and used for making 8.15X46 R target rifles in the Post WW1 period when new Commercial proofs and SN were added. I have also learned in past 8 years that some Target rifles with ring dates from the 1908-1914 and GEW 98 marked had SN and BU proofs that appeared to indicate a Post WW1 period. Its possible these SN were some type of in-house designated SN group that most likely represented a SN group that was combined with actual Pre-WW1 period G 98 production numbers in those years by Mauser. Such rifles did Not follow the actual Commercial SN system Mauser used, only looked like. Here is A full Commercial Gew 98 SN 77357 BU proofs and WFM 1908 Ring date, Has Banner in stock right side many parts with Imperial Inspection marks. WM under grip and Lang site. This was one of those G98 for Vatican. `The actual SN if in true Mauser Commercial run would be 1913/14 period etc. I have seen other similar examples in past years . Jon