That's an interesting date notation for a quarterly book: July-Sept Usually the publishers lined it up with a season: Fall, Summer, etc. As a result, both DC Special 4 and HoS 81 have the same cover date of September. But from the page 1 scan posted earlier, DC Special 4 was written as if it was the reader's first introduction to Abel. It's the first Abel appearance, and a significant one: I count 9 panels he appears in, and he introduces 2 of the 13 stories. I'd be surprised if the appearance in HoS 81 is any less "brief."