Ungraded vs Grade 6.0 Heavy Metal #18 (1978): price difference
Heavy Metal #18 (1978) value — Ungraded $18 vs Grade 6.0 $50. Grade 6.0 sells for 2.78× Ungraded (+178%). Prices updated August 2026.
Medians of real sold listings per grade, updated August 2026 — how we compute values.
Ungraded vs Grade 6.0
$18→$50
Grade 6.0 sells for 2.78× (+178%) the Ungraded price — a $32 difference per comic.
Should you get this comic graded?
Grading runs about $30 per comic all-in. On Heavy Metal #18 (1978), the jump from Ungraded to Grade 6.0 is worth $32 (2.78×) — 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).