Ungraded vs Grade 8.0 Sub-Mariner #28 (1970): price difference
Sub-Mariner #28 (1970) value — Ungraded $8 vs Grade 8.0 $51. Grade 8.0 sells for 6.38× Ungraded (+538%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 8.0 sells for 6.38× (+538%) the Ungraded price — a $43 difference per comic.
Grade 6.0 sells for 4.38× (+338%) the Ungraded price — a $27 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Sub-Mariner #28 (1970), the jump from Ungraded to Grade 8.0 is worth $43 (6.38×) — 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).