ACTION COMICS #600

Cover shown in a protective sleeve appears glossy with strong color and sharp corners; no visible creases, spine stress, or edge chipping in this image. Slight glare along the right edge may be obscuring minor surface wear. Grade is capped conservatively since only the front cover is visible and interior/back cover condition could not be assessed.

Action Comics #600 arrived as DC's 50th-anniversary-adjacent milestone issue, a double-sized special published in May 1988 during John Byrne's post-Crisis stewardship of the Superman titles. The issue features multiple stories bridging the modern Superman with his Silver Age history, bringing back Superboy and the Legion of Super-Heroes in a time-spanning narrative, with contributions from writers and artists including Byrne on the cover. It functions as a celebratory anthology-style anniversary book rather than a book built around a first appearance, death, or origin, placing it outside the ranks of true key issues.

Market data reflects that profile: sales activity clusters at the high end of the census, with a strong population of 9.6 and 9.8 copies reflecting robust print runs and collector tendency to preserve anniversary issues in top condition at time of purchase. Values rise sharply only in the gem-mint tier, consistent with a book whose demand is driven by nostalgia, Superman-family completism, and Legion of Super-Heroes crossover interest rather than by speculative key-issue demand. Mid- and low-grade copies see little transactional data, indicating thin demand for anything below high grade.

This is a book collected primarily by Superman and Legion completists building long-run sets, along with buyers targeting round-number anniversary issues for display value. High-grade CGC 9.6 and 9.8 slabs carry a real premium and see steady turnover, while raw copies in mid and low grades trade closer to bulk-box pricing with minimal competition. It is best positioned in a dealer archive as a strong-condition anniversary piece rather than a speculative key.