Dating a blue mason jars
The very first versions with this embossing are believed to date from approximately 1913, with production continuing to about 1960.
Hundreds of slight variations in lettering font, glass color, base markings, etc., exist, and this particular type of jar presents a wide field of study for fruit jar collectors and glass historians.
Thus, if a random sampling of these jars are studied, (for instance, just looking at a selection of only those marked with a number “2” on the bottom) , it may be seen that the numbers typically appears slightly different, in fact “unique” in it’s exact formation, from one jar to the next.
It may take a while before exact duplicates are found – that is, finding two jars that were made from one individual, specific mold.
somewhat akin to the practice of collecting coins and comparing their minor “mold” or “die” variations.
There are various shades and tints of these colors out there.
Other popular jars made by Ball include the Some Ball Perfect Mason jars are found with the number “13” on the bottom.
As mentioned earlier in this article, most Ball-produced jars are typically found with a mold number ranged between 0 and 15, so naturally some percentage of them will carry the number “13”.
(IMPORTANT NOTE: please see the paragraphs with info farther down on this page describing modern reproductions of this jar, including the “AMERICAN HERITAGE COLLECTION” introduced in 2013, and the new “Collectors Edition” BALL PERFECT MASON jars being sold as of 2019).
They are commonly seen for sale on the secondary market at antique malls, farm auctions, flea markets, yard sales, and on online auction sites.