Bottom of cobalt blue bottle

Hi, I found the bottom of a blue glass bottle on a beach and wondering if someone can help me identify! The only mark on it is the #12....thank you!


  • We can't know for certain but it could very well be one of the ubiquitous cobalt blue Phillips Milk of Magnesia bottles (or perhaps a competing brand)

    It is probably earlier to mid 20th century date-wise

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