Need help dating GOODYEAR porcelain letters sign

Hello, im trying to get a better idea of when goodyear used YELLOW porcelain letters and logos. I have seen a number of blue and white ones online but cant find information on when the yellow ones were manufactured.

The sign im referring to is the individual letters spelling GOOD (then the winged foot logo) YEAR.

Cant seem to upload a picture. Any information would be greatly appreciated

 

You might be able to find your answer here.

https://corporate.goodyear.com/en-US/about/history.html

Peggy

 

I've glanced at it before but couldn't find the history of the advertising there... might be worth giving corporate a call though

 

check what ebayers are selling just for examples......some say 1939....1940's, or even into the early 1900's for airplane tires....

 

Try resizing your picture. I think people say 600x800 or something close to that.