Markings.
Frame size is marked on the barrel lug.
https://parkerguns.org/images/ident/frame.jpg
The weight of the barrels is marked on the flats (weighed before striking).
https://parkerguns.org/images/ident/bblweight.jpg
And in this example, we know that the grade of steel is “Vulcan”, and the barrel maker was Walter King.
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