MARVEL TEAM-UP #91

Cover shows strong gloss and bright colors with sharp corners and no visible creases or color breaks. There is minor edge wear at the bottom corners and a slight bend at the lower right tip. The book is in a protective sleeve which limits full assessment of surface sheen; interior and back cover were not examined.

Marvel Team-Up #91, cover-dated March 1980, is part of the Bronze Age run that paired Spider-Man with a rotating cast of Marvel guest stars each issue, a format that ran parallel to Marvel Two-in-One's pairing of the Thing with other heroes. The series was a workhorse title for Marvel through the 1970s and into the 1980s, giving writers and artists room to experiment with unusual character combinations outside the continuity constraints of Spider-Man's own book. This issue does not carry a first appearance, origin, or other landmark event, and its cover, while typical of the era's dynamic Spider-Man artwork, is not among the covers cited by price guides as a design classic.

Market data for the issue is sparse, reflecting its status as a mid-run, non-key entry in a long series. The handful of recorded sales show a wide spread between mid and top grade, with the small number of 9.8 sales commanding a real premium over the lone mid-grade data point, a pattern consistent with a low overall submission population where a handful of pristine copies set the ceiling. Demand is driven primarily by Spider-Man's presence on the cover and by collectors assembling complete runs of the title rather than by any recognized key-issue premium.

This book trades as a bulk or filler item in low and mid grades, priced for completists filling gaps in a Marvel Team-Up or Spider-Man guest-appearance collection rather than for investment-grade demand. High-grade census copies are scarce enough that a well-preserved 9.8 example can command a disproportionate premium relative to lower grades, making this a book where grade, more than any inherent story significance, determines value.