Ungraded vs Grade 8.0 Adventure Comics #388 (1970): price difference
Adventure Comics #388 (1970) value — Ungraded $7 vs Grade 8.0 $34. Grade 8.0 sells for 4.86× Ungraded (+386%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 8.0 sells for 4.86× (+386%) the Ungraded price — a $27 difference per comic.
Grade 6.0 sells for 2.57× (+157%) the Ungraded price — a $11 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #388 (1970), the jump from Ungraded to Grade 8.0 is worth $27 (4.86×) — at today's prices that doesn't cover the fee — grading this one is for the collection, not the flip. A grade below the top one changes the math, so run your exact numbers first.
Run the grading break-even math →Values are estimates from real sales data — not appraisals or offers. Some links earn JunkPal a commission at no cost to you (disclosure).