Ungraded vs Grade 8.0 Adventure Comics #321 (1964): price difference
Adventure Comics #321 (1964) value — Ungraded $10 vs Grade 8.0 $162. Grade 8.0 sells for 16.2× Ungraded (+1520%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 16.2× (+1520%) the Ungraded price — a $152 difference per comic.
Grade 6.0 sells for 14.1× (+1310%) the Ungraded price — a $131 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #321 (1964), the jump from Ungraded to Grade 8.0 is worth $152 (16.2×) — 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).