CHALLENGERS OF THE UNKNOWN #43

Cover shows moderate wear typical of a mid-grade Silver Age book: light corner blunting at top left and bottom right, a faint vertical crease running through the lower right dinosaur figure, and slight edge wear along the right border. Colors remain bright with good gloss retention and no major color breaks or stains visible; the book is in a protective sleeve which adds some glare. Spine appears mostly tight with only minor stress lines near the top. Interior and back cover were not assessed.

Challengers of the Unknown #43 arrived in mid-1965, well into the title's post-Kirby run, when Bob Brown had settled in as the book's principal artist and the series had shifted from Jack Kirby's foundational sci-fi/monster tone toward a more conventional adventure-team format built around Ace Morgan, Professor Haley, Rocky Davis, Red Ryan, and June Robbins. The issue carries no first appearance, origin, or landmark creative event that price guides single out, placing it squarely among the title's substantial mid-run output rather than among its recognized keys.

Market data reflects that status: a small certified population of only 20 CGC Universal copies shows a steep curve typical of a low-demand back-issue, with prices climbing sharply only in the near-pristine tiers. Sales at 6.5 and 8.5 sit in double and low-triple digits, while 9.4 and 9.6 copies have traded in the $500-950 range on scarcity of high-grade survivors rather than character or story significance. With only a single 9.8 on record and no transaction attached to it, top-end value is driven almost entirely by census rarity.

This is a book for Challengers of the Unknown completists and Silver Age DC adventure-genre collectors building toward a full run rather than crossover or key-issue buyers. Raw copies in low and mid grades trade cheaply and steadily as filler for long boxes and set-builders, while high-grade certified copies command outsized premiums purely because so few have been submitted, making the top of the grade scale a thin, condition-census-driven market rather than one shaped by collector demand for the story itself.