I have a similar sign but it's huge. Something like 6x8ft and it is made of reflective paint over die cut metal with a wood frame on the back, dated 1964. Glows in the dark! The can on mine doesn't have racing flags but pink stripes.
I think mine is 700-800 and i would rate it 8.5.
Collect small Oklahoma Oil Co.'s 1920's-1940's. Barnsdall, Cushing, Eason, Marland, etc.