For that early of a gun, either hammer screw pictured could be considered correct. The very early screws had more to f a domed head. Some had a out lip and some did not. The engraving on both screws is correct for a grade 2.
The trigger plate repair would be at the back under the trigger guard when it is installed, so it wouldn't really show when all is said and done.
The broke location of the trigger guard will make for a delicate repair and file work to dress it down, but it will not stick out like a sore thumb in that area. And you can add patina in multiple ways.
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B. Dudley
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