HOUSE OF MYSTERY #172

Cover shows moderate wear consistent with a mid-grade Silver Age book: visible surface creasing and a diagonal crease line running through the lower right portion of the cover art, slight corner softness at top corners, and minor edge wear along the top and right border. Colors remain bright with good gloss retention overall, no major stains or tears noted, but the book is in a plastic sleeve which obscures fine spine detail. Interior and back cover were not assessed.

House of Mystery had by early 1968 become a superhero title in all but name. Dial 'H' for Hero, launched in issue #156, headlined the book with Robby Reed and his alphabetical talisman, while J'onn J'onzz, the Manhunter from Mars — displaced from Detective Comics and then from his own top billing here — carried the backup slot. This issue delivers both: a Dial 'H' story in which a malfunctioning dial turns Robby's friend into a monster, and "Manhunter's Stolen Identity!", a body-swap plot built on Martian meteorite pseudo-science. Frank Springer supplied the cover and the lead feature's art, with the Martian Manhunter chapter in the house style Joe Certa had maintained across the character's long backup tenure. The issue sits two numbers from a genuine turning point: with #174 the title abandoned costumed heroes entirely and became the Cain-hosted horror anthology that defined it for the next fifteen years.

Market behavior follows that of a non-key late-Silver DC anthology run book. Demand comes chiefly from run collectors filling the #156-#173 Dial 'H' stretch and from Martian Manhunter completists, both of whom buy mainly in raw mid grades, where supply is adequate and turnover is slow but steady. Guide values and dealer asks have stayed in a narrow band for years, and the issue rarely appears in major auction consignments on its own — when it surfaces at Heritage or ComicConnect it is usually as part of a run lot or a certified high-grade single. What does distinguish it is census thinness: only a small handful of copies have been certified at all, with almost nothing at the top, a consequence of low submission interest rather than genuine printing scarcity. That combination — negligible certified population against a modest raw market — makes graded results volatile and single-bidder dependent.

Buyers divide cleanly. The raw trade is run-building territory, and copies in the mid grades move at levels that make completing the Dial 'H' sequence inexpensive; low-grade copies function as reading and placeholder material and are frequently absorbed into multi-book lots. Certified interest is a different and much smaller pool: registry-minded DC collectors and condition specialists who pay a steep premium for the top of a sparse census, knowing the next comparable copy may not appear for years. Anyone considering submission should weigh grading cost against a book whose value curve stays flat through Very Fine and only turns sharply at the Near Mint end. The prudent approach is to buy raw for the run and treat any top-census slab as a speculative, illiquid position rather than a benchmarked one.