An amber shoulder seal quart embossed with a circled Keystone figure above MASON. These rare jars are notorious for poor embossing that is sometimes nearly invisible, but this example is the exception, and one of the best you will find, with a nice clear embossed logo and lettering. Sparkling clean glass with no damage or stains. Excellent ground rim with very little nicking. Base 71.

est 700-1000