I have a growing collection of Ball Jars and finally set out to learn more about them. Bob Clay’s website offers a great deal of information on Ball Jars. The image below is from his website. If you want to learn more about the history of Ball Jars please check out his website.
This jar dates from 1910-23. Look at the a and notice Ball is underlined.
Here is another one from 1910-23. Notice how the P in perfect is in a different placement.
This is a larger jar from 1910-23. The P once again has a different location.
This grouping dates from 1923-33. Note the a and the lack of underlining on the Ball.
Here is another jar from 1923-33. This one is imprinted with Ideal.
In 1975 Ball introduced a Bicentennial jar that was produced for three years.