Ungraded vs Grade 8.0 Detective Comics #257 (1958): price difference
Detective Comics #257 (1958) value — Ungraded $36 vs Grade 8.0 $580. Grade 8.0 sells for 16.11× Ungraded (+1511%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 16.11× (+1511%) the Ungraded price — a $544 difference per comic.
Grade 6.0 sells for 6.94× (+594%) the Ungraded price — a $214 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Detective Comics #257 (1958), the jump from Ungraded to Grade 8.0 is worth $544 (16.11×) — 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).