I was wondering if there has been any of those type decals put on the back of a car on the paint. I have a touring so the only glass is the windsheild. I have done a search on this site and only found examples on the glass.
Thank you for any info.
Guess you're referring to the WW1 era. I'm unsure if printed decals were available back then - it would have been more typical of the era to custom paint any decoration - like company name on trucks and hacks. But were many cars personalized with war slogans during 1917/18? Maybe, I just haven't seen any pictures of it yet.
Later from the mid 20's up through the 40's when the Model T got less fashionable and millions of used T's became cheap cars for young people, painted slogans with humorous messages all over the car, including the back, were much more common.
One common way to show your views were to mount a license plate topper with a slogan. They were made like license plates in thin painted sheet metal. I've seen toppers promoting presidential candidates and endorsing or opposing prohibition.