First design barrel lump or lug.
Thank you for the prompt and detailed reply. It is obvious that you know double guns, both from collecting but more to the point, from shooting them, and I surmise, shooting them a great deal. Perhaps I misspoke. His older Smith 10 has the first series square cornered barrel lug design. You are 100% correct about the 90% angle from the standing breech to the water table, or floor of the frame. I have seen a few very early Ithaca hammer guns with twist steel barrels that did not have a machined radius at that point, and you could see, with a 10X magnified, the spider webbed stress cracking on the metal areas.
I can ask him about fotos, but he does not have a computer nor Internet access, so I cannot promise that I could get them posted here. Again, thanks for the prompt response to my inquiry.
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