IRON MAN #121

Cover shows strong gloss and bright color with sharp corners and clean spine; a UPC barcode confirms newsstand edition. Minor handling wear is visible at the top edge and a faint diagonal crease/scratch line near the upper right of the sky area, along with slight glare from the protective sleeve obscuring some detail. No major creases, tears, or color breaks are apparent, and the spine appears tight with no visible stress lines. Interior and back cover were not assessed.

Iron Man #121 closes out a two-part clash between Tony Stark and Namor the Sub-Mariner, scripted by David Michelinie and Bob Layton with pencils by a young John Romita Jr. The issue falls at the front edge of the celebrated "Demon in a Bottle" storyline that would culminate a few issues later in #128, and it introduces or develops supporting cast members Bethany Cabe, Hiram Dobbs, and Jonas Hale who became fixtures of the Michelinie/Layton run. The creative team's tenure on the title is widely regarded as a high point for the character, giving surrounding issues like this one steady collector interest even without a headline first appearance.

Market data shows a book that trades cheaply through the mid grades and then climbs sharply at the top of the census. Certified sales cluster in the $32-$44 range from grade 7.0 through 9.4, with 9.6 copies still modest at roughly $50, before a pronounced jump to a $600 FMV at 9.8 on a healthy 35 recorded sales. That curve is typical of a Bronze Age newsstand comic with a large surviving population (161 universal census copies) and no major key status: demand is concentrated almost entirely among grade-chasers competing for top-census slabs rather than among character or first-appearance collectors.

For most buyers this is an affordable series-run title, picked up raw in low-to-mid grade to fill out a Michelinie/Layton or Romita Jr. collection rather than as a standalone investment. The real action is at the 9.8 tier, where scarcity relative to the deep 9.4-9.6 population drives outsized premiums; sub-9.6 copies remain accessible and price-stable. Expect continued modest, steady demand from Iron Man completists and Bronze Age Marvel runs, with any appreciation concentrated at the census apex.