Dating presto jars
There were a bunch of bottles, flasks, mugs and glasses, none fruit jar related.
There were some nice jars, like four midgets - one Hero cross, the others monogram.
One that he never was able to completely answer involves the Drey jars.
The history behind this line of jars is fairly well known.
The problem that Dick Roller faced was this: This theory did not explain the existence of Drey Perfect Mason jars that had some very distinctive Ball characteristics, characteristics that Ball didnt introduce until well after the molds should have been worn out.
can be found with grippers (ribs) on the sides and concentric circles on the base.
The standard thinking was that Ball dropped the Automatic Sealer line of jars after they acquired Schram, but continued to use the Drey molds at the old Schram plants over the next few years until they wore out.
A few Drey molds were even known to have been modified, the "Drey" being changed to read "Ball." The Ball Square Mason jars are one example.
Instead, I mean how do you tell how old your Ball jar is?
One of the most common emails I receive comes with a description of a jar—e.g., Blue pint Perfect Mason with the number 5 on the bottom—and the question, “How old is my jar?