What do numbers on bottom of Mason jars mean?

What do numbers on bottom of Mason jars mean?

Many Ball mason jars have a number printed on the bottom of the jar, but this is a mold number that does not indicate the year of production. Rather, the mold number tells you where the jar was positioned on the glass-making machine that was used to produce it.

How much is a blue mason jar worth?

Typically, the smaller or more common antique jars can go for about $20 apiece, but the more rare versions can sell for as much as $300.

How can you tell how old a Mason jar is?

So if you have some old jars, how do you know their true age? If you have a Ball jar, you can date most of them just by looking at the logo. Every few years, the Ball Manufacturing Co changed the logo and if you compare yours to a reliable chart, you know how old it is.

How do I know if my jars are vintage?


  1. Pontil marks or indented rings in the bottom of the jar mean it was hand finished by a glass blower.
  2. Seams also help determine the age of your jar: Seams that go all the way up the jar indicate it was machine made, probably between 1895 and 1915.
  3. Color can also help date your jar.

Why are old Mason jars blue?

Feeling Blue Those blue mason jars were mass produced until 1937 using sand from around Lake Michigan. It was that sand that gave the glass its blue hue.

What is a perfect mason jar?

The Ball Perfect Mason was a brand of glass fruit jar (canning jar) made by the Ball Bros. Glass Manufacturing Company. Hundreds of millions (probably upwards of a billion or more!) were made, and these jars have been used by home canners throughout much of the 20th century.

How old are Knox Mason jars?

The Knox jars were made in the 1940s by the Knox Glass Bottle Co. in Knox, PA The pints and quarts are worth about $6. The half pints and half gallons are of greater value to collectors.

How old is a perfect mason jar?

The Ball “Perfect Mason” jar, one of the most common jars of this style, was introduced circa 1913 and produced until the mid-20th century. It had several variations, including a square-shaped jar.

How much do canning jars cost?

What’s the price of canning jars? The current cost of an 8 oz jar in 2021 averages around $1.00 each. In 2019 they were between $0.50 – $0.75 per jar, depending on the source. Menards has the best prices (and they ship), at $0.66 per 8 oz jar.

How old are Drey Mason jars?

Drey jars (pronounced dry) were made from about 1917 through the 1920s by the Schram Glass Mfg. Co. of St. Louis, MO and later by the Ball Brother’s company.

What colors do Ball Mason jars come in?

Each mason jar is made from high-quality stained glass in a variety of different colors. These colors include purple, green, pink, blue, amber, red and clear.

What do the numbers mean on a ball Mason Jar?

Modern Ball mason jars are marked with many different numbers, and those numbers vary by the company which is manufacturing them under the Ball brand name. The numbers can refer to the plant location, the job or batch number and the date of manufacture.

Are there any Mason jars with blue glass?

The jar in this photo, second from the right, is one of only four known to exist with blue glass and a thumbscrew top. Even more rare and valuable than uncommon colors are jars with quirks. This Ball Mason jar is the result of a molding error, where the logo and name were stamped on upside-down.

How many Mason jars are there in the world?

According to one expert, only about a dozen jars like this exist in the world, making them collectors’ items. Other Mason jars were deliberately stamped with the logos upside down so the jar could

How can you tell how old a mason jar is?

Well, first you have to tell how old the jar is, and you can tell its approximate age by the design of the logo. This chart shows how the label for the Ball jar company, which started producing mason jars in 1885, has changed over time. If you have a jar with one of the older logos, it will likely be worth more than one with a newer logo.