Ungraded vs Grade 8.0 Adventure Comics #340 (1966): price difference
Adventure Comics #340 (1966) value — Ungraded $11 vs Grade 8.0 $98. Grade 8.0 sells for 8.91× Ungraded (+791%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 8.0 sells for 8.91× (+791%) the Ungraded price — a $87 difference per comic.
Grade 6.0 sells for 4.45× (+345%) the Ungraded price — a $38 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #340 (1966), the jump from Ungraded to Grade 8.0 is worth $87 (8.91×) — 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).