![Mephisto [Diamond Preview] #78 1990 Universe Marvel](/api/images/junkpal-products/sports/mephisto-diamond-preview-78-marvel-1990-universe-sport/cover.webp)
Grade 9 vs PSA 10 Mephisto [Diamond Preview] #78 1990 Universe Marvel: price difference
Mephisto [Diamond Preview] #78 1990 Universe Marvel value — Grade 9 $73 vs PSA 10 $2000. PSA 10 sells for 27.4× Grade 9 (+2640%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
PSA 10 sells for 27.4× (+2640%) the Grade 9 price — a $1,927 difference per card.
Should you get this card graded?
Grading runs about $30 per card all-in. On Mephisto [Diamond Preview] #78 1990 Universe Marvel, the jump from Grade 9 to PSA 10 is worth $1,927 (27.4×) — 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).