ADVENTURE COMICS #304

Cover shows a noticeable vertical crease/wrinkle running through the DC logo box and top banner, plus a diagonal crease near the top edge. Spine area has some wear ticks and slight roll visible along the left edge. Corners show light rounding and there's minor surface wear/soiling consistent with age; the book is housed in a protective sleeve which obscures fine edge detail. Interior and back cover were not assessed.

Adventure Comics #304 arrived in January 1963 during the run when Supergirl headlined the anthology title, several years before the Legion of Super-Heroes assumed lead-feature status. The era is notable for consistent Curt Swan-school artwork and the ongoing development of the Supergirl mythos as DC built out her supporting cast and Kryptonian lore in the months following her introduction. The issue is a representative example of this transitional Adventure Comics period rather than a book tied to any single first appearance or landmark event.

Market data shows a thin but active census, with the bulk of demand concentrated in mid and high grades and comparatively soft pricing through the low end. Sales are sparse at several grade points, and the single 9.8 on record has changed hands only twice, meaning the top of the curve is set by very limited data. The steep value jump between 9.4 and 9.8 reflects typical Silver Age grade scarcity rather than any spike in collector demand tied to content.

This book trades primarily as a Silver Age Superman-family filler and Supergirl-run piece for collectors building out the character's early solo appearances or completing Adventure Comics runs. Low- and mid-grade raw copies see modest, steady interest at affordable price points, while the rare high-grade certified copy commands outsized premiums driven almost entirely by census scarcity. It is not a book pursued by key-issue investors, but it holds a stable niche role for Supergirl and Silver Age DC completists.