C. 1910 quart fruit jar embossed "Red Mason" with a key embossed through the word red. Has zinc and porcelain lined screw on Mason lid and smooth lip. The color is apple green. The jar is heavy, with great color and many small bubbles. Has an outside lip chip and very minor lip roughness, both hardly noticeable and covered when lid is on. Mold number 7 on base. Measures 7" high.