Louis Aimar on his way to winning the 1941 Grand Prix des Nations:
http://www.wooljersey.com/
Aimar was French pursuit champion, and wears his champion's jersey for this time trial. The bike is probably a Terrot, though I can't make any sense of the decal above the pump holder. Note the arms like Popeye, braze-on shift lever, relatively small tires for the era, Pelissier-type thorn catcher on rear brake. From "Le Miroir des Sports" new series No.24, 15 September 1941.
Aldo Ross
Middletown, Ohio