Gerben,
P-08 delivered after August 4, 1913 were all to have a stock lug (Still, "Imperial Lugers"). At best, I think this survey will let us more closely date a particular part of the production range. Also, it will be interesting to see if a mix of frame styles turns up in a short serial # range.
As far as having both frame variations in stock at the same time, I think the existence of the 1914 DWMs with no lugs demonstrates this quite well.
Information is not flooding in, so any conclusions will probably be extremely generalized.
--Dwight
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