Ungraded vs Grade 8.0 Sub-Mariner #18 (1969): price difference
Sub-Mariner #18 (1969) value — Ungraded $7 vs Grade 8.0 $47. Grade 8.0 sells for 6.71× Ungraded (+571%). Prices updated September 2026.
Medians of real sold listings per grade, updated September 2026 — how we compute values.
Grade 8.0 sells for 6.71× (+571%) the Ungraded price — a $40 difference per comic.
Grade 6.0 sells for 2.71× (+171%) the Ungraded price — a $12 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Sub-Mariner #18 (1969), the jump from Ungraded to Grade 8.0 is worth $40 (6.71×) — 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).