You might wonder if Ball canning jars are the same ... see Mason jars with the Kerr name on it. And, ironically, Anchor Hocking, which makes dishes similar to vintage Pyrex also made Mason jars ...

Kerr Wide Mouth Half-Pint Jars This set of ... Ball Golden Harvest Vintage Canning Jars Capture the essence of timeless preservation with Ball’s Golden Harvest Vintage Canning Jars!