Hi Dwight,
Nice project. But please keep in mind that during 1913-1914 DWM were working on a number of foreign contracts, most of which had no stock lugs. Finding a correct change-over time can be tricky since they were bound to have both frame variations in stock for quite some time (up to the 1930s).
On the other hand, the changeover would have been accompanied with some formal date set by the producer and the German WaA and it would not surprise me if the changeover started with a new serial range or a freshly delivered batch. I'm looking forward to your conclusions.
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