Old Ball Jars are worth some money and some Old Ball Jars are worth several hundred dollars depending on the condition and age of the Old Ball Jars.
Many canning jars feature the manufacturer's name or the patent date embossed on the glass.
According to Minnetrista, the embossing style can help you date the jar, especially for those made by the Ball Corporation.
An embossed design that is unusual or unique will fetch more.
To tell how old the old Ball Jars are first check the logo, which changed fairly frequently until about 1962.
The earliest logo was the intertwined BBGMC—Ball Brothers Glass Manufacturing Company—used on jars made in Buffalo, New York.
Rejoice if you find one of those; Buffalo jars are pretty rare.