Hello Rich. I am going with your projectile is a Mle 1936 without its piercing or ballistic caps.
Now, I hate to question the master; however, I have seen no evidence that there ever was a French made tracer AP round, Mle 1938, for the antitank gun. The German documents supplied by greif only show the Mle 1936. The German documents do show a Mle 1936 AP with tracer, but it is German made with a German tracer element No. 1. Why do you think there was a French 47mm AP Mle 1938 for the antitank gun? I believe you have a 47mm AP round with the magnesium nose painted yellow; does this projectile have a tracer element? If it has a tracer element, is it a German No. 1 element?
Why is there no French military documentation out there for many WWII ammo items - 47mm AT gun, 47mm tank, 37mm tank, 75mm tank, 25mm AT gun, 81mm mortar rounds? I have a book titled "Notes on French Ordnance" written by a US Army officer that covers items up to 1936. It has excellent copies of French documentation for all ammo up to the end of WWI, but it has nothing for the WWII items. I know the French had manuals and did documentation. Where did it all go?