CAPTAIN AMERICA #310

Cover shows strong gloss and sharp corners with no visible creases or color breaks. Spine appears tight with no stress lines visible in this view. Minor handling wear may be present but not detectable at this resolution; book is in a protective sleeve which slightly obscures fine surface detail. Interior and back cover were not assessed.

Captain America #310 (October 1985) arrived during Mark Gruenwald's long tenure on the title, at the outset of the Bloodstone Hunt storyline that would run through much of the following year. The issue is notable chiefly for introducing Rachel Leighton, later known as Diamondback, who would go on to become one of Captain America's recurring allies and love interests before joining the Thunderbolts and other Marvel ensembles in the 1990s and beyond. Paul Neary provided interior art and the cover, working from Gruenwald's scripts during a period when the Captain America title was exploring street-level crime and espionage plots alongside its costumed-villain fare.

The book's market behavior reflects its status as a minor rather than major key: demand is real but modest, driven almost entirely by completists of Diamondback's history and Captain America supporting-cast collectors rather than mainstream first-appearance speculation. The FMV curve shows a pronounced premium at 9.8 and 9.6, where certified population remains comparatively thin relative to raw survival, while mid and lower grades trade for a fraction of that value, typical of a direct-market Copper Age issue that was neither over-hoarded nor especially scarce in circulation.

Collecting interest in this issue skews toward Captain America specialists and character-completist buyers tracking Diamondback's publication history rather than broad key-issue investors. Raw copies in low and mid grades remain inexpensive and plentiful, making the book an accessible entry point, while the gap to a 9.8 slab is wide enough that grade-sensitive buyers should expect a real premium for top-census condition rather than a smooth linear climb.