4 vintage 1 qt Kerr Self-Sealing Mason wide mouth canning jars, lot #3

Lot of four vintage round Kerr Self-Sealing Mason wide mouth canning jars.

We've been told that these jars are pre-war (probably 1930s) as the round shape was discontinued during WWII when it was decided that a square shape with rounded corners was a more efficient shape.

These jars are in very nice shape, but there are no lids included.