Ungraded vs Grade 8.0 Adventures into the Unknown #18 (1951): price difference
Adventures into the Unknown #18 (1951) value — Ungraded $38 vs Grade 8.0 $158. Grade 8.0 sells for 4.16× Ungraded (+316%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 4.16× (+316%) the Ungraded price — a $120 difference per comic.
Grade 6.0 sells for 3.68× (+268%) the Ungraded price — a $102 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Adventures into the Unknown #18 (1951), the jump from Ungraded to Grade 8.0 is worth $120 (4.16×) — 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).