John you are far more knowledgeable than I in this regard, but don't the nitro proof mark and other proof marks just indicate it was proofed between 1904 and 1954? If there is something else that indicates year I am missing please educate me. I also didn't think 2 inch 12s came along until the 20s and 30s? It is definitely Birmingham.
I can't make out the small letters on the crossed swords, the larger letter below is a G I now believe, but I think that is an inspectors mark.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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