Base Set 2 Magnemite #79: PSA 9 vs PSA 10

Base Set 2 Magnemite #79 shows a meaningful PSA 10 premium between PSA 9 and PSA 10: a $22 dollar gap, with the gem mint multiplier at 2.9x. Based on the last tracked PSA 10 sale of $33.00 on Nov 8, 2025, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.

PSA 10

$33.00

Last sale $33.00 on Nov 8, 2025 UTC

PSA 9

$11.50

Last sale $11.50 on May 15, 2026 UTC

PSA 8

$18.28

Last sale $18.28 on May 22, 2026 UTC

The Spread

The PSA 9 to PSA 10 spread on Magnemite #79 Base Set 2.

$22

Dollar gap, PSA 9 to PSA 10

2.9x

PSA 10 sells for 2.9x a PSA 9

Three-Outcome EV Calculator

PSA 9 acquisition cost ($)

PSA resub cost ($)

Probability of each outcome (must total 100%)

PSA 10 (upgrade) 15%

PSA 9 (regrade) 70%

PSA 8 (downgrade) 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

Math favors holding the 9

Where this card lands in the broader Base Set 2 picture: a non-holo with a $22 gap between PSA 9 and PSA 10. The PSA 9 to PSA 10 jump on WOTC-era cards reflects population scarcity at the top grade, not raw print run.

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