Broken Bottle, thick, and old. A "C" on the bottom

[KONO]

-Found at a Louisiana Plantation
-Has bubbles in the bottom
-thick glass

Looks old, so I figured I would ask: what is it?

 

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[KONO]

This should probably be in the bottle thread, my mistake.

 

[mick56]

Might be the base to a beer bottle.