SWSH12: Silver Tempest Serena #207: PSA 9 vs PSA 10
The PSA 10 to PSA 9 spread on SWSH12: Silver Tempest Serena #207 is a wide gem-mint premium: $63, with PSA 10 copies trading at 3.8x a PSA 9. Based on a recent PSA 10 sale of $93.00 on May 14, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$85.67
Last sale $93.00 on
PSA 9
$22.84
Last sale $22.50 on
PSA 8
$14.67
Last sale $14.00 on
The Spread
The PSA 9 to PSA 10 spread on Serena #207 SWSH12: Silver Tempest.
$63
Dollar gap, PSA 9 to PSA 10
3.8x
PSA 10 sells for 3.8x 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
Where this card lands in the broader SWSH12: Silver Tempest picture: a non-holo with a $63 gap between PSA 9 and PSA 10. The PSA 9 to PSA 10 jump on WOTC-era cards reflects population scarcity at the top grade, not raw print run.
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