Base Set 2 Rhydon 59/130: PSA 9 vs PSA 10
On Base Set 2 Rhydon 59/130, PSA 10 sells for 1.2x a PSA 9, a $4 delta, which is a modest premium. Based on the last tracked PSA 10 sale of $23.50 on Oct 7, 2024, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$23.50
Last sale $23.50 on
PSA 9
$19.43
Last sale $19.43 on
PSA 8
$19.50
Last sale $21.00 on
The Spread
The PSA 9 to PSA 10 spread on Rhydon 59/130 (Base Set 2).
$4
Dollar gap, PSA 9 to PSA 10
1.2x
PSA 10 sells for 1.2x 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
Where this card lands in the broader Base Set 2 picture: a WOTC-era card carrying a $4 gap between PSA 9 and PSA 10, a 1.2x multiple on the PSA 9 price.
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