Ball "Perfect Mason" mason jar in "Ball Blue" colored glass with metal screw lid. Embossed with "BALL" in cursive with "PERFECT MASON" below. Basic Cylindrical Mason jar shape. Embossed with a 6 on bottom.
Metal lid is embossed with ATLAS on top, so likely mismatch. as porcelain inside. Porcelain is embossed "GENUINE BOYD'S CAP FOR MASON JAR 2-2" around the edge with the Hazel-Atlas "H over A" mark in the middle.
BALL logo dates to 1923-1933 according to: https://masonjars.com/history-of-ball-jars.html
