Ungraded vs Grade 8.0 Adventure Comics #428 (1973): price difference
Adventure Comics #428 (1973) value — Ungraded $24 vs Grade 8.0 $128. Grade 8.0 sells for 5.33× Ungraded (+433%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 8.0 sells for 5.33× (+433%) the Ungraded price — a $104 difference per comic.
Grade 6.0 sells for 2.92× (+192%) the Ungraded price — a $46 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventure Comics #428 (1973), the jump from Ungraded to Grade 8.0 is worth $104 (5.33×) — 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).