Ungraded vs Grade 8.0 Adventure Comics #309 (1963): price difference
Adventure Comics #309 (1963) value — Ungraded $10 vs Grade 8.0 $128. Grade 8.0 sells for 12.8× Ungraded (+1180%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 8.0 sells for 12.8× (+1180%) the Ungraded price — a $118 difference per comic.
Grade 6.0 sells for 4.6× (+360%) the Ungraded price — a $36 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #309 (1963), the jump from Ungraded to Grade 8.0 is worth $118 (12.8×) — if your copy grades at the top, that premium can cover the fee. 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).