Mason's Patent Nov. 30th 1858
Early on in the history of canning jars the most popular form of seal was the screw-on zinc cap, the precursor to today's screw-on lids. The earliest successful application of this was discovered by Mason and patented on November 30, 1858, a date embossed on thousands of jars. Jars with "Patent Nov 30th 1858" were made in many shapes, sizes and colors well into the 1900s. Since they were made in such quantity and used for such long periods, many of them have survived to the present day.
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