Albert
I like the time frame, the "Russian Lugers" have the same type of frame as the Portuguese M2 and that is I believe the last time it was used. They were issued in 1909. The Portuguese Navy's that came in 1910 have the newer style frame.
So the frame style and the Bulgaria independence in October 1908 go hand in hand.
I have also noted some close similarities in machine marks between the Portuguese M2 and several Russians so yes, you could say you have both documentation and physical evidence to support your theory as to their dated production.
Very intersting post you presented to us!
Vern
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