Just joining this topic. I have always thought slogan cancels were a very interesting topic to study and exhibit that really doesn't cost a lot of $$$. But it is fun and interesting and as this thread shows there is so much to study. I have shown three from my collection. I have a pretty large specialized collection of these advertising slogan cancels from the 1939-40 New York World's Fair. These cancellations were used at several post offices around New York to publicize the 1940 season on the Fair.