You can figure out things like if the barrels are black powder or nitro proofed, the diameter of the bores and if that has been changed, choking, chamber length, etc. Diggory Hadoke has an excellent video on his YouTube page that explains how to decipher English proofing marks.
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"Where would a minister be without the help of sin, or the dry without alcohol?"
Gene Hill
Shotgunner's Notebook
"May the honkers fly low and slow."
Douglas Bandemer
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