Stuff like this is a kick, I love it. I wish I had all the ones my dad got over the years as a salesman. I have one, my brother has another. Mine is an icecream scoop basically telling you that if you have tilt wheel steering you can eat all the ice cream you want because if your belly hits the wheel you can tilt it up out of the way.
My brothers is a "Crying towel" from the Buick "Crying towel" sale around 1969. I have never seen a ruler like you have, that is so cool. A lot of these these were throw away sort of stuff so there are none left. Just like the paper and coardboard signs in the show room. I saw these things for YEARS my dad was a salesman my whole childhood at a Buick dealer. Man I wish I had just one of those signs that were tossed in the garbage at the end of the year for my garage, that would be so cool.