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Not sure if they show but I found two 2 Qt. fruit jars at a family estate. One was Nov 30,1958 Mason with a Atlas lid the other was a Root Mason with a Ball lid. I'm going back tomorrow to look again.
I like the Root, it can be dated fairly well. Somewhere between 1901 and 1913. Even closer may be only to 1909 or so assuming Ball continued with the mold for a while.