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PSA 10: PriceCharting; refreshed Sep 10, 2026
GemDelta shows Koffing (Base Set #51) at $1.32 market price (TCGplayer market). Its Delta multiple is 29.5x.
A PSA 10 Koffing (Base Set #51) is currently shown at $97.57. GemDelta labels this as an unverified PriceCharting guide fallback rather than verified recent sales.