DETECTIVE COMICS #364

Cover shows moderate handling: visible vertical creasing and surface wrinkling across the pink background, mild corner softness at top right and bottom left, and slight edge wear along the right border. Colors remain bright with no major fading, tears, or missing pieces, and there is no significant spine roll visible though some minor stress lines are present near the spine. The book is in a protective sleeve, and the back cover and interior pages were not assessed.

Detective Comics #364 arrived in June 1966, during the period when the Batman titles were undergoing the visual overhaul associated with Carmine Infantino's redesigned covers and a leaner, more streamlined Dark Knight. The issue is a representative Silver Age Batman and Robin adventure rather than a book tied to a first appearance, origin, or landmark creative debut, placing it firmly in the category of solid mid-run material for completists of the title rather than a recognized key.

The certified population is modest at 129 Universal copies against 135 total graded, and the FMV curve reflects a book whose demand is driven almost entirely by grade scarcity at the top end rather than storyline significance. Prices climb gently through the mid grades before rising sharply above 9.0, with the 9.6 tier commanding a clear premium over 9.4 and the single known 9.8 remaining unsold and unpriced on record. This pattern is typical of well-collected but non-key Silver Age Batman issues, where raw and low-mid grade copies trade cheaply while true high-grade rarity drives outsized returns.

This is a book for Batman run-builders and Silver Age condition-census chasers rather than key-issue investors. Lower and mid-grade raw copies will move steadily but modestly as filler for long-box sets, while a 9.8 slab, given its apparent uniqueness on the current census, would likely draw competitive bidding from registry-focused collectors seeking the top spot regardless of the story's historical weight.