Base Set Nidoran ♂ 55/102: PSA 9 vs PSA 10
Base Set Nidoran ♂ 55/102 shows a meaningful PSA 10 premium between PSA 9 and PSA 10: a $41 dollar gap, with the gem mint multiplier at 2.4x. Based on the most recent PSA 10 sale of $85.00 on May 19, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$69.50
Last sale $85.00 on
PSA 9
$28.87
Last sale $25.75 on
PSA 8
$16.17
Last sale $16.50 on
The Spread
The PSA 9 to PSA 10 spread on Nidoran ♂ 55/102 (Base Set).
$41
Dollar gap, PSA 9 to PSA 10
2.4x
PSA 10 sells for 2.4x 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 picture: a WOTC-era card carrying a $41 gap between PSA 9 and PSA 10, a 2.4x multiple on the PSA 9 price.
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