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Need help with mold number on Ball Perfect Mason jar

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    Posted 8 years ago

    (1 item)

    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?

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    1. aghcollect aghcollect, 8 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, 8 years ago
      Thank you for your help
    3. hartballjr, 6 years ago
      what if there is no number at all
    4. lwjars, 5 years 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.
    5. CrystalM, 3 years ago
      I have a blue mason jar with a question mark on the bottom. It has no dot just the hook.. Any info or idea about this?
    6. jarsnstuff jarsnstuff, 3 years ago
      CrystalM, please post a photo of your jar and start a new thread with your question. I'm sure someone can give you an answer!

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