Ungraded vs Grade 8.0 Sub-Mariner #18 (1969): price difference
Sub-Mariner #18 (1969) value — Ungraded $10 vs Grade 8.0 $46. Grade 8.0 sells for 4.6× Ungraded (+360%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 8.0 sells for 4.6× (+360%) the Ungraded price — a $36 difference per comic.
Grade 8.0 sells for 2.71× (+171%) the Grade 6.0 price — a $29 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 $36 (4.6×) — 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).