ADVENTURE COMICS #339

Image is upside down (rotate 180 to correct). Visible defects include a noticeable crease/bend along the upper right edge, some spine stress visible near the top of the cover (bottom when corrected), light surface wear, and minor edge wear along the borders. Corners appear moderately sharp but with slight blunting. Interior and back cover were not assessed, and the book is in a protective sleeve which may obscure some minor surface defects.

Adventure Comics #339 arrived during the mid-1960s stretch when the title had become the exclusive home of the Legion of Super-Heroes, the 30th-century team of teenage heroes that DC had spun out of the Superboy backup feature into a headlining act. By December 1965 the Legion was a fixture of the book, with Curt Swan's clean, classical pencils defining the look of the team for a generation of readers and Jerry Siegel, co-creator of Superman himself, contributing scripts during this period of the run. The issue is a representative entry in a long, tightly continuous run rather than a standalone landmark, but it sits within a series prized by collectors for its role in building out the Legion's expanding roster and future-set science-fiction concepts.

Market data for the issue reflects a modest, low-census Silver Age back issue rather than a heavily chased key. Certified sales cluster in the low-to-mid grades, with prices climbing from the mid-sixty-dollar range at grade 4 up to $160 at grade 9, a curve typical of a well-collected but non-key Legion issue where demand is driven by run-builders and Legion completists rather than speculative first-appearance buyers. Top-grade material is scarce on census, with only a handful of copies graded above 9.2 and just one recorded 9.6 sale, meaning gem-quality copies trade infrequently and pricing at the very top is thin.

This is a book for collectors assembling a run of Silver Age Adventure Comics or the Legion of Super-Heroes rather than buyers chasing a single grail. Lower and mid-grade raw copies remain affordable and trade steadily as reading and run-filler copies, while a true CGC 9.8 would command a significant premium purely on the strength of its rarity within the certified population, appealing to condition-census collectors of the Swan-era Legion material even though the issue carries no first appearance or other headline key attribute.