ADVENTURE COMICS #366

Cover shows moderate wear consistent with a mid-grade Silver Age book: soft corners on all four tips, visible spine stress with slight color break near the top and bottom of the spine, and light surface scuffing across the green background art. There is a small crease/bend visible along the lower left edge and minor edge wear along the top edge. Colors remain bright with no notable fading, staining, or tears observed. Interior pages and back cover were not assessed in this photo.

Adventure Comics #366 arrived in the late Silver Age as the Legion of Super-Heroes title continued its run in the anthology-turned-team-book format, pitting the Legionnaires against the solar-powered villain Dr. Regulus. By this point Adventure Comics had become synonymous with the Legion, and the series offered a dense ensemble cast and cosmic-scale plotting that distinguished it from Superman-family books of the same era. The issue reflects the house style of DC's Mort Weisinger-edited line, with Curt Swan-influenced art direction typical of the period's Legion stories.

Market data shows a book that trades as a steady mid-tier Silver Age collectible rather than a high-demand key: raw and low-grade certified copies move in single-digit-to-low-double-digit dollar amounts, with a gentle rise through the mid grades. The real value curve steepens sharply only at the top of the census, where a thin population of 9.6 copies commands a meaningful premium and no 9.8 has yet traded, pointing to genuine scarcity at the pinnacle rather than broad collector competition across all grades. This is a common pattern for Legion-era Adventure Comics issues: modest demand in low-to-mid grade, disproportionate premiums for condition rarity at the top.

The book's audience is largely Legion of Super-Heroes completists and Silver Age DC run-builders rather than speculative buyers chasing a first appearance or landmark event. Mid- and low-grade copies are readily available and inexpensive, making this an easy addition to a run rather than a targeted acquisition. High-grade census-top copies, by contrast, appeal to registry-focused collectors pursuing condition rarity within an otherwise unremarkable issue, and will continue to command outsized prices relative to the rest of the grade curve.