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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 not 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.

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