My first thought was a hood ornament from the 40's - early 50's. I could be wrong, but in your pictures it looks like one side is flatter and the other more curved, which led to my somewhat wild guess. Not the exact model I have in mind but close.
I thought it was 62 plymouth decklid
the olds you have pictured not close
the side that’s flat is because it was stepped on.
also I thought 64/5 dart? Hood ornament