Ungraded vs Grade 8.0 Adventure Comics #320 (1964): price difference
Adventure Comics #320 (1964) value — Ungraded $9 vs Grade 8.0 $139. Grade 8.0 sells for 15.44× Ungraded (+1444%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 15.44× (+1444%) the Ungraded price — a $130 difference per comic.
Grade 6.0 sells for 4.78× (+378%) the Ungraded price — a $34 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #320 (1964), the jump from Ungraded to Grade 8.0 is worth $130 (15.44×) — 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).