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How can I date molded bottles?

Molded Bottles

To date a molded bottle, look at the height of the seam, the higher the seam-the later the bottle. Pre-1860, the side mold marks don't go all the way up the neck of the bottle. In the late 1800's they ran to about a quarter inch from the top. After 1903, the seam will run all the way to the top of the bottle.

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