Are square jars unusual?
Square jars were considered a design improvement because a homemaker could stack more jars together in less space thus allowing a family to put up more food in their small cellars or cupboards. Square Jars were made for the Smalley Fruit Jar Co. Boston, Mass in the late 1890s. Other square jars date from the 20s, 30s and later. The value of square shaped jars tends to be higher than round as it seems that fewer square jars were made. A number of different companies did make the square style jars as the design wasn’t exclusive to any one manufacturer.