Base Set 2 Imposter Professor Oak 102/130: PSA 9 vs PSA 10
The PSA 10 to PSA 9 spread on Base Set 2 Imposter Professor Oak 102/130 is an unusually wide gem-mint premium: $34, with PSA 10 copies trading at 5.9x a PSA 9. Based on the last tracked PSA 10 sale of $41.00 on Feb 2, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$41.00
Last sale $41.00 on
PSA 9
$7.00
Last sale $7.00 on
PSA 8
$10.50
Last sale $10.50 on
The Spread
The PSA 9 to PSA 10 spread on Imposter Professor Oak 102/130 (Base Set 2).
$34
Dollar gap, PSA 9 to PSA 10
5.9x
PSA 10 sells for 5.9x 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
Base Set 2 102/130 Imposter Professor Oak is a WOTC-era release from 2000. The gap between its PSA 9 and PSA 10 prices is $34.
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