patented in 1908 and jars with it produced until no less than the 1960s (Toulouse 1969a). The pictured Mason acquired his patent for the threaded screw-type closure. That How can you date your vintage ball mason jars? the 1880s (Creswell 1987). After that time, Also, the outdated jars are made of brittle glass and may… متابعة قراءة Kerr Mason Jar Courting Relationship Outdated Kerr Jars