CHALLENGERS OF THE UNKNOWN #61

The book is photographed rotated 90 degrees but shows moderate wear consistent with a mid-grade Silver Age copy: visible spine stress lines and light color break along the spine, a soft corner at the upper right of the cover, and some minor surface scuffing on the purple background. The book is in a protective sleeve, which adds glare but doesn't fully obscure edge wear along the top and right edges. Interior pages and back cover were not visible for assessment.

Challengers of the Unknown #61 arrived in the spring of 1968, well into the title's Silver Age run chronicling the adventures of Ace Morgan, Professor Haley, Rocky Davis, Red Ryan, and June Robbins — the DC team of daredevils who lived on borrowed time after surviving a plane crash. By this point in the series the Challengers had settled into a formula of pulp-inflected science fiction and adventure plotting, without the landmark firsts or major character introductions that define the earlier issues from the team's 1957-1960 launch period.

Market data reflects a book with a thin but real collector base rather than broad demand: census populations at every grade are small (often a single digit), and most grades show only one or two recorded sales. Pricing rises steeply toward the top of the census, consistent with the general Silver Age pattern where high-grade survivors are scarce and command outsized premiums relative to mid- and low-grade copies, but the underlying sample size is too small to establish a deep, liquid market at any tier.

This is a title-completist and Silver Age DC team-book acquisition rather than a speculative key. Raw copies in worn condition trade as inexpensive filler for Challengers runs, while mid-grade copies appeal to readers assembling a complete series set. High-grade certified copies are genuinely scarce on census and will draw competitive bidding when they surface, but that top-end result should be read as a reflection of scarcity of graded material rather than broad collector demand for issue #61 specifically.