When was the "Mopar" moniker spawned?

Just saw this old heater posted on C/L

Mopar Dodge Plymouth 1930 1940 Deluxe Heater - auto parts - by owner...

Mopar Dodge Plymouth 1930 1940 Deluxe Heater - $80 (Spokane Valley, WA.)

Pulled from a Willys Wagon (the early models didn’t come with heaters so folks swapped in whatever would fit, or whatever they had laying around). Stamped Mopar on the top, pretty cool piece for rat rod, repurposed center console, or put it in your Dodge, Chrysler, Plymouth, or whatever rad ride your restoring.

80.00 takes it home!

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