DETECTIVE COMICS #366

This pre-1977 book has a single edition, so no direct/newsstand distinction applies. Visible defects include spine stress lines and a small tick along the left spine edge, mild corner softening at the top right and bottom right, and slight surface wear/rubbing to the cover gloss. The book is in a protective sleeve with some glare, and a faint vertical crease is visible near the left edge; interior pages and back cover were not assessed.

Detective Comics #366 arrived in August 1968, during the period when Barbara Gordon's Batgirl had become a regular presence alongside Batman and Robin in the title, following her debut the previous year. The issue is a product of DC's late Silver Age house style under editor Julius Schwartz, with Irv Novick supplying the era's characteristic dynamic Batman-family cover work. It is representative of the dependable, well-illustrated Batman team-up material of the period rather than a foundational or first-appearance issue.

Market activity reflects that status: certified sales cluster in the $60-$130 range across the bulk of the grading spectrum, with pricing rising only modestly from low to mid-high grades and no meaningful sales record above CGC 9.0 despite a modicum of higher-graded copies existing on census. Demand is driven primarily by Batman-family and Batgirl completists building out Silver Age Detective Comics runs rather than by first-appearance or origin-story collectors, which keeps the book's overall price ceiling comparatively low relative to true keys of the same era.

This is a run-filler for advanced Batman collectors and a value entry point for those assembling late-1960s Detective Comics in high grade. Raw copies in low and mid grades trade cheaply and steadily, while a top-census CGC 9.8 would likely draw a rarity premium from grade-conscious buyers given how few copies have been certified at the top of the pool, even without a corresponding sales history to confirm that ceiling.