If the grade is stamped, it will be stamped on the water table of the action. Before worrying much about other details, get the letter and the gun in one place and tell us what you see. The "proofs" you refer to are probably patent dates which don't tell a lot about an individual gun. A 15 pound eight gauge would be an exceptionally heavy Parker. Your gun, if characteristic of the gauge, would more likely weigh from 11 to 12 1/2 pounds.
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