Ungraded vs Grade 8.0 Adventure Comics #421 (1972): price difference
Adventure Comics #421 (1972) value — Ungraded $4 vs Grade 8.0 $60. Grade 8.0 sells for 15× Ungraded (+1400%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 15× (+1400%) the Ungraded price — a $56 difference per comic.
Grade 6.0 sells for 5.5× (+450%) the Ungraded price — a $18 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #421 (1972), the jump from Ungraded to Grade 8.0 is worth $56 (15×) — 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).