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  1. #1

    How old is this clear (mason fruit?) jar with empty keystone

    Trying to date this jar. Initial research says the empty keystone is for Rosso who was a wholesaler and not a manufacturer. This particular keystone seems to be tied to mason fruit jars as well, although I don't know if Mason would be a general term or a brand here. It has a horizontal diamond pattern design around the top & bottom of the body of the jar. The bottom of the jar is marked: (top line) JM 4616; (center line) 7, empty keystone. Any idea what the JM or numbers mean and what period this is from? Thanks!
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    Last edited by kjkovach; 04-18-2017 at 02:14 PM.

  2. #2
    Junior Member New Bottler
    Join Date
    Feb 2014
    Location
    Southern Indiana
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    The empty keystone is connected with Knox Bottle Company (and their series of glass plants). The jar has absolutely nothing to do with Rosso, who distributes reproduction fancy-colored tableware and novelties (not utilitarian jars) in EAPG (Early American Pattern Glass) patterns. Rosso uses an "R in a keystone" as his mark.


    Just a guess, but the jar looks to be from the 1930s or 1940s. The JM-4616 is probably a style/catalog/inventory number assigned to that mold design.

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