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Unread 09-28-2025, 09:55 PM   #5
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The circle stamp with the large S and smaller P inside on the bottom of the barrel lug is the J. Stevens proof mark of the time. I don't have pictures of a 20-gauge, but here are some pictures of a .410-bore of about the same vintage --

C48223 01 .410-bore SPRINGFIELD.jpg

C48223 07.jpg

C48223 03a.jpg
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