This ad depicts a Bantam BRC-60.
“From a 1941 issue of The Saturday Evening Post, this is an ad for Champion Spark Plugs with art by Vickery. Illustrated are 8 uses for Champion Spark Plugs:
1. Bomber, Trainer, Airliner or Light Plane
2. Tanks
3. Reconnaissance Car or Jeep
4. Motorcycle
5. PT Boats of the Mosquito Fleet
6. American Industry
7. Farm Tractors
8. Trucking Industry
13 5/8″ x 10 1/8″
Excellent condition”