Ungraded vs Grade 8.0 Heavy Metal #13 (1978): price difference
Heavy Metal #13 (1978) value — Ungraded $22 vs Grade 8.0 $129. Grade 8.0 sells for 5.86× Ungraded (+486%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Grade 8.0 sells for 5.86× (+486%) the Ungraded price — a $107 difference per comic.
Grade 6.0 sells for 3.55× (+255%) the Ungraded price — a $56 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Heavy Metal #13 (1978), the jump from Ungraded to Grade 8.0 is worth $107 (5.86×) — 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).