ADVENTURE COMICS #321

Cover shows moderate wear consistent with a Silver Age book: mild corner softening at the top right and bottom left, light surface scuffing across the black background areas, and a faint crease line near the lower left corner. Colors remain bright with no visible fading, and there is no evident tearing or major creasing across the spine area, though the spine itself is not clearly visible due to the photo's orientation. Interior pages and back cover were not assessed in this evaluation.

Adventure Comics #321 arrived in June 1964 during the title's long stretch as the home of the Legion of Super-Heroes, the 30th-century team of teenage heroes that DC had been steadily building out since their 1958 debut. By this point in the run the Legion feature was firmly established as the book's main draw, with Edmond Hamilton scripting and John Forte handling art chores for much of the era, delivering the dense continuity and sprawling supporting cast that made the Legion a cult favorite among younger readers of the period. The issue does not carry a widely cited first appearance or landmark event, but it is a representative artifact of the mid-1960s Legion serial that helped define the team's cosmic, soap-operatic style before the character roster exploded later in the decade.

Market data reflects a typical mid-tier Silver Age back-issue profile: values stay compressed and modest through the mid and high-mid grades, then spike sharply at the top of the census, where surviving copies become scarce. That kind of curve is common for anthology-format Silver Age comics that were read and handled heavily by young readers, leaving few high-grade survivors relative to demand from Legion completists and Silver Age DC collectors. Demand is driven less by any single event in the issue and more by the ongoing collector interest in assembling complete Legion of Super-Heroes and Adventure Comics runs from this period.

This is a book that trades as a supporting piece in a broader Legion or Adventure Comics collection rather than as a standalone target. Lower and mid-grade raw copies move steadily but cheaply among Silver Age DC readers and set-builders, while the rare high-grade certified copy commands outsized premiums purely on condition scarcity. Buyers are typically long-time Legion of Super-Heroes fans and Silver Age DC specialists completing structured runs, with top-grade examples of interest mainly to census-chasing registry collectors.