FWIW - I had to wonder at my own question.
Some notes:

John Landis Mason (1832-1902) was a U.S. tinsmith, who envisioned the gasket/seal lid, threaded metal seal-ring, and manufacturing mold for the "Mason Jar". He held several U.S. patents from 1858 and later. He sold off his rights to some of his patents.

The Ball Brothers had a manufacturing plant in Buffalo, N.Y., that made glass-lined containers for kerosene. Around 1884, they realized some of Mason's patents had expired and began making Mason jars.

The Ball Company was building a new factory in Muncie, Indiana, when the Buffalo plant burned down, around 1886.

The Ball Co. was ethical and paid a License fee to put the "Mason" name on their Ball Jars.

Both Mason jar and Ball Jar are correct terms for FredC's 'screw top jar'.

"Kerr" was another prolific maker of "Mason Jars".

Attached: one of Mason's patent drawings and Ball Logos to date your powder container/Moonshine container.

(FredC's jar dates 1960 or later).

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