Base Set 2 Mewtwo #10: PSA 9 vs PSA 10
Base Set 2 Mewtwo #10 shows one of the widest gaps in vintage WOTC between PSA 9 and PSA 10: a $5,530 dollar gap, with the gem mint multiplier at 14.9x. Based on a recent PSA 10 sale of $3,181.82 on May 17, 2026, the crack-and-resub math favors the resub: expected value is positive even at a conservative 15% upgrade probability.
PSA 10
$5,928.92
Last sale $3,181.82 on
PSA 9
$398.58
Last sale $387.50 on
PSA 8
$155.91
Last sale $130.00 on
The Spread
The PSA 9 to PSA 10 spread on Mewtwo #10 Base Set 2.
$5,530
Dollar gap, PSA 9 to PSA 10
14.9x
PSA 10 sells for 14.9x a PSA 9
Three-Outcome EV Calculator
15%
70%
15%
Defaults are conservative starting points. Adjust based on the specific slab. A borderline 9 with strong centering plays differently than a 9 with edge wear.
PSA 10 outcome (sale price minus resub minus acquisition)
$0
PSA 9 outcome (regrade, no upgrade)
$0
PSA 8 outcome (downgrade, slower sell, tied capital)
$0
Expected Value
$0
Math favors holding the 9
Base Set 2 #10 Mewtwo Holo released in 2000 sits in the vintage WOTC tier where gem-mint premiums above $5,530 are common. PSA 10 populations shrink faster than supply on cards of this era, which is why the upgrade arbitrage stays alive.
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