Grade 9 vs PSA 10 Sea Serpent #373: price difference
Sea Serpent #373 value — Grade 9 $9 vs PSA 10 $17. PSA 10 sells for 1.89× Grade 9 (+89%). Prices updated July 2026.
↘ Falling · -95%
Medians of real sold listings per grade, updated July 2026 — how we compute values.
Grade 9 vs PSA 10
$9→$17
PSA 10 sells for 1.89× (+89%) the Grade 9 price — a $8 difference per card.
Should you get this card graded?
Grading runs about $30 per card all-in. On Sea Serpent #373, the jump from Grade 9 to PSA 10 is worth $8 (1.89×) — at today's prices that doesn't cover the fee — grading this one is for the collection, not the flip. 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).