Don't know if this helps, but I have a DWM 1913 WITHOUT stock lug, serial number 11xx-b, and a DWM 1913 WITH stock lug, serial number 42xx-b. Assuming an orderly transition, which I doubt, this would bracket the changeover in the "b" block. Perhaps others can add to this data and narrow the bracket.
As you probably know a few of the 1914 DWMs were built WITHOUT stock lug. However, I have seen only three examples. I have one of these, but it is not in great condition.
It is intersting that you could narrow it down a bit, however the 1914's put a kink in it being exact.
Were they rejects or reworks and used in 1914? It seems unlikly that they were "extra" parts, or they would have been used?
The photo caption on p. 42 lists serial numbers of six other 1914 DWMs in the 8000a--9000a serial range, the text on page 23 mentions them as well.
C/X is not a "regular" inspector's stamp. According to Görtz & Bryans (p.134) the letter surmounted by the crown was the first letter of the Inspector's family name. In the case of two inspectors whose names started with the same letter, the junior inspector would use a stamp with an uncommon letter, C/X or C/Y. I remember reading someplace (and cannot now find the reference, if someone could either confirm or refute this I would really be glad) that C/X was also used by new Inspectors who were on the job but had not yet received their own stamp.
By the 1914 production year the decree was in place that all P-08 were to be manufactured with a stock lug. At the time of the late a block production, frames which had been manufactured in a previous year, but not yet assembled into finished pistols, found themselves in the production line. As these pistols were technically "out of spec" they should have been rejected, but for some reason--probably having to do with the necessity to maintain production numbers--these pistols were appealed to some higher authority--the supervisor of inspectors or the head of the arsenal at Spandau, perhaps--who agreed to their acceptance. As this authority might not have had a regular inspector's stamp, the C/X was used in its place.
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