Hi Dwight,
Nice study. As mentioned earlier, the Crown/N appeared as replacement of the Crown/B/U/G as the result of a changed 1911 proof law.
If I look at your results (without any reference on AE production totals to back me), I would say that the 1911 turnover point must be somewhere between serials 459xx and 51xxx.
It would be very interesting to see more AE serials in that range. I doubt if calibre would have influence on the marking.
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