O shoot it's broken
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The Bottom of the Kerr jar has a 26No date on the bottom? The first selfseal registered trademark was june 26, 1934. First used on oct 1, 1904. They renewed the trademark on dec 20, 1949. My best guess would be 1934 or later. Kerr selfseal masons have the same embossing in the 40s and 50s as your mason. Earlier than trademark date did not have the registered trademark embossed on them. Hope this helps. Nice finds and good luck with Your dump! It also seems to be 1930s -60s. Give or take.