Ungraded vs Grade 8.0 Detective Comics #139 (1948): price difference
Detective Comics #139 (1948) value — Ungraded $230 vs Grade 8.0 $990. Grade 8.0 sells for 4.3× Ungraded (+330%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 4.3× (+330%) the Ungraded price — a $760 difference per comic.
Grade 8.0 sells for 2.31× (+131%) the Grade 6.0 price — a $562 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Detective Comics #139 (1948), the jump from Ungraded to Grade 8.0 is worth $760 (4.3×) — 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).