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I notice that the popular Bormioli Rocco stoppered glass bottles have numbers on the bottom. Some higher quality ones I have are numbered "18" and some more recently bought ones have the number "14". Does anyone know what these numbers mean?

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    Usually such numbers just identify which mold the glass was shaped in.
    – Ecnerwal
    Mar 13, 2017 at 13:09
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    @Ecnerwal I doubt that because the mold for the bottom of the bottle is different than the mold used for the sides of the bottle.
    – Drisheen Colcannon
    Mar 13, 2017 at 13:35

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I did some some more research and Ecnerwal is right, it is a mold identification number.

Each manufacturer numbers their molds kind of like a baseball team has unique numbers for each player. This number is placed in the center of the bottom of the bottle.

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