Compare: Professor's Letter

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Same name, different sleeves. Signal compares each row against the reference printing's recent market price.

By printing

signal vs primary
PrintingMarketListed midDealer buy
Foilprimary
$1.85
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Each price is compared against the primary printing's recent market price.

Same name across sets

SetPrimary printingMarketSignal vs reference
Professor's LetterXy BreakthroughFoil$1.07-42%
Professor's LetterXy BreakthroughNormal$0.32-83%
Professor's LetterXy BreakthroughFoil$1.07-42%

Reference: Xy Base Set · Foil $1.85.