This is a Vintage ‘Mason’s Patent November 30^th 1858’ Blue Cobalt Jar. There were two variations of this blue color. The first were clear ones which were later painted blue. The second were those that were actually made blue during their creation. This one was originally created blue and NOT altered later, making it the rarer of them. Although it could use a cleaning on the inside, the jar itself is in mint condition!  

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