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Need help with mold number on Ball Perfect Mason jar

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Tlsweat7203's likes1 of 3who made this wonderful bottle?Vintage Buttons
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    Posted 4 years ago

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    Hi, I have been searching to no avail as to what the number is on the bottom of my blue Perfect Mason jar with zinc lid, it appears to be a backward 6 underscored, or backward 9 over scored but it has a much longer tail and doesn't look at all like the 6's or 9's I've seen. Could someone give me an idea as to what it is?

    Mystery Solved


    1. aghcollect aghcollect, 4 years ago
      The number is a mold number - the underscore is to differentiate between a nine and a six - yours is a six. Normally these appear from looking at the base, but yours is backwards and was probably eventually changed to the correct mold configuration. - The Ball logo was used between 1923 and 1933 as shown here on my logo link;
      And picture 3 of my link here is what a glass mold machine looked like, hence the different mold numbers on the jar bases
    2. indalay1746, 4 years ago
      Thank you for your help
    3. hartballjr, 2 years ago
      what if there is no number at all
    4. lwjars, 1 year ago
      hartballjr: Each manufacturer had their own system of mold marks to identify which mold the jar was made in. Some had no marks on the base.

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