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# Why are blue ball mason jars numbered on the bottoms?

# How old is a ball perfect mason jar with 1 on the bottom?

A Ball Mason jar with a number 1 on the bottom is not very old. The 1 on the bottom denotes the type of recycling the jar requires if one is to recycle it. Recycling was n…ot a big factor in manufacturing until the late 1970's. CORRECT ANSWER: I'm sorry but your answer is very incorrect. There have never been numbers on glass to denote recycling needs. Glass is glass. The numbers you refer to are on plastics. The number on the bottom of most jars indicates the mold number and/or, on the much older jars, the mold blower's ID and count references.

# What is the value of a blue canning Mason jar with the number three on the bottom?

It's worth about $20.00 depending on it's condition. The number on the bottom usually represents the number of the glass blower. The glass blower would be able to keep account… of how many jars he or she blew that day... The most sought after blue mason jars have the number 13 on the bottom. It was said that most of them were broken by superstitious people who didn't want to use a jar with the number 13 on it.

# What is the value of blue perfect mason canning jar with the number 15 on the bottom?

Quart size = 12.99 half gallon = 19.99 This is buy it now on eBay I get mine by the pound though so prices vary.

# What is the value of blue Perfect Mason canning jars with the number 2 marked on the bottom?

they are 25 dollars each

# What is the value of blue Mason Jar with three dots on bottom?

Many of these blue Mason jars are worth prices close to $25 each. The exact price will vary depending upon the condition of the jar.

# What is the value of a blue mason jar with no 9 on the bottom?

About a dollar at a rummage sale.

# What is the Value of blue mason jar that says ball perfect mason and no7 on the bottom?

A Perfect Mason,Blue,Zinc lid, 1 qt around $14.

# What is the value of a blue ball Perfect Mason canning jar with a number 1 on the bottom?

Well, this jar would be around 2 dollars. I have 20 of them that are sitting in my basement that I found in a barn.

# What is the value of blue mason jar that says ball perfect mason with an no 1 on the bottom?

It is worth $6 - $15 depending on condition and true age.

# What does the number 3 mean on the bottom of an old ball blue quart jar?

The understanding is each worker was asigned a number and that's that worker number

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In Antiques

# What is the value of a blue Perect mason canning jar with the number 1 marked on the bottom?

They are not worth a lot, the number 1 is the size of the jar. All jars of that size will have a 1 on them.

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In Antiques

# What do the numbers on the bottom of mason jars stand for?

There is usually a makers mark on the bottom of the jar and the numbers are generally the mold numbers that the jar was made from. They can also contain date codes as to when …the jar was made, but normally are only mold codes. They can also give reference (via the mold codes) as to where the jar was manufactured.

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# Value of blue ball perfect mason jars blue with 5 on the bottom?

2.00

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# What is the value of a blue-tinted Mason jar that has the number 6 on the bottom?

I believe the the number 6 is for recycling purposes. There are still many variables to determine the price, but I don't think you should expect much mo…ney.

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In Antiques

# What is the value of blue perfect mason jar with the number 4 on the bottom?

When it comes to old bottles, you need to be really precise in your description. My guess is that you have a jar that is marked "Ball Perfect Mason" but that limits things dow…n to dozens of variants. Most are not worth that much but there are exceptions to every rule. Your best bet is to post a photo with a clear description on an antique bottle forum site and connect with other collectors.