The small 3 stamp closest to the breech is the grade stamp. It was not done on grade 2 and lower. J.G. in the oval is the stamp of barrel maker Jim Geary and the T in the circle is the stamp for Titanic Steel. I don't know the significance of the two dots but are probably a mark of any of a number of procedures in barrel making, striking, rough-fitting, fine-finish fitting and regulating. The T and 16 have me stumped.
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