SWSH12: Silver Tempest Forest Seal Stone 156/195: PSA 9 vs PSA 10
The PSA 10 to PSA 9 spread on SWSH12: Silver Tempest Forest Seal Stone 156/195 is an unusually wide gem-mint premium: $42, with PSA 10 copies trading at 6.2x a PSA 9. Based on the last tracked PSA 10 sale of $50.00 on May 1, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$49.86
Last sale $50.00 on
PSA 9
$8.00
Last sale $8.00 on
PSA 8
$1.00
Last sale $1.00 on
The Spread
The PSA 9 to PSA 10 spread on Forest Seal Stone 156/195 (SWSH12: Silver Tempest).
$42
Dollar gap, PSA 9 to PSA 10
6.2x
PSA 10 sells for 6.2x 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
SWSH12: Silver Tempest 156/195 Forest Seal Stone Holo is a modern-era release from 2022. The gap between its PSA 9 and PSA 10 prices is $42.
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