Base Set Tangela 66/102: PSA 9 vs PSA 10
The PSA 10 to PSA 9 spread on Base Set Tangela 66/102 is a wide gem-mint premium: $73, with PSA 10 copies trading at 3.2x a PSA 9. Based on the most recent PSA 10 sale of $107.52 on May 30, 2026, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$105.58
Last sale $107.52 on
PSA 9
$33.00
Last sale $37.51 on
PSA 8
$30.75
Last sale $29.50 on
The Spread
The PSA 9 to PSA 10 spread on Tangela 66/102 (Base Set).
$73
Dollar gap, PSA 9 to PSA 10
3.2x
PSA 10 sells for 3.2x 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
Base Set 66/102 Tangela is a WOTC-era release from 1999. The gap between its PSA 9 and PSA 10 prices is $73.
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