The indicia of #10 states "entered as second class matter December 27 1928".
Boody Rogers recalled, “A friend had told me that Dell Publications was starting a comic book. The offices were at 100 Fifth Avenue. [...] I came to their building. It was just before the arch in Greenwich Village.
“I showed my one page of “Rock Age Roy” to the editor. He bought it! [...] Then I did some other things—“Deadwood Gulch,” “Campus Clowns,” “Sancho and the Don,” and some puzzle pages. Dell bought them all. [...]
“I didn’t realize it then, but I was working on the first comic book ever published. It was the right idea, but the wrong format. It was more like a tabloid paper than the small comic books of today. It only lasted a year, but, thank God, it got us started in New York City.”