An Ounce is a term for a maneless lion: Natural Panther, Catamount or Cougar/Mountain Lion or a Lioness. They are Rampant by default.
This moon wouldn't work as it's a color on a color and the underlying charge can only partially be seen on one side.
Below are Heraldic Panthers:
English Panther - Guardant by default, Flames (Breath) from mouth and ears, often with roundels as shown
Continental Panther - A maneless lion with eagle claws and breathing flames - sometimes shown with horns.
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