Base Set 2 Rattata 89/130: PSA 9 vs PSA 10
On Base Set 2 Rattata 89/130, PSA 10 sells for 5.3x a PSA 9, an $81 delta, which is an unusually wide gem-mint premium. Based on the last tracked PSA 10 sale of $100.00 on Apr 4, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$100.00
Last sale $100.00 on
PSA 9
$18.77
Last sale $18.77 on
PSA 8
$9.37
Last sale $9.37 on
The Spread
The PSA 9 to PSA 10 spread on Rattata 89/130 (Base Set 2).
$81
Dollar gap, PSA 9 to PSA 10
5.3x
PSA 10 sells for 5.3x 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 Base Set 2 picture: a WOTC-era card carrying an $81 gap between PSA 9 and PSA 10, a 5.3x multiple on the PSA 9 price.
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