I do not know but I doubt it was before 1934 unless a special order and after 1919 information on special orders is scarce. I have examined two "12 ga for 3" shells" guns and both actually had slight swamping in the breech area forward of the chambers but without measuring wall thicknesses it was just a visual observation. The few "10ga for 3 1/2" shells" guns I have seen including Destry's GH which I see often are pretty "straight sided".
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