Ungraded vs PSA 10 Mark McGwire #656 1991 Upper Deck Baseball: price difference
Mark McGwire #656 1991 Upper Deck Baseball value — Ungraded $1 vs PSA 10 $19. PSA 10 sells for 19× Ungraded (+1800%). Prices updated July 2026.
Medians of real sold listings per grade, updated July 2026 — how we compute values.
PSA 10 sells for 19× (+1800%) the Ungraded price — a $18 difference per card.
Grade 9 sells for 10× (+900%) the Ungraded price — a $9 difference per card.
Should you get this card graded?
Grading runs about $30 per card all-in. On Mark McGwire #656 1991 Upper Deck Baseball, the jump from Ungraded to PSA 10 is worth $18 (19×) — 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).