Circa 1928 - Flat black 20_194 American Flyer bodied gravel car.

Circa 1929 - Glossy black 20_198 American Flyer bodied gravel car. 

We can't verify this car, but show it here for you to decide. The car is 100% American Flyer except for the end plates. The one carries the numbers 20-197 which wasn't used on any of the 1929 freight cars - the Ives flat car carried the number 197.

Circa 1930 - Black Lionel bodied gravel car.