1990 Post #1 Don Mattingly NM/M (Near Mint/Mint) : Collectibles & Fine Art

1990 Topps Baseball Cards – 25 Most Valuable … PLUS Bonus Listings! – Wax Pack Gods

MLB Don Mattingly Baseball Trading Cards

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Don Mattingly #1 Prices, 1990 Score

1990 Post #1 Don Mattingly NM/M (Near Mint/Mint) : Collectibles & Fine Art

MLB Don Mattingly Baseball Trading Cards

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Don Mattingly #12 of 30 (1993 Post) Collector Series, New York Yankees

Calaméo - Spring 2023

Calaméo - REA Fall Auction 2022

Topps – Page 3 – SABR's Baseball Cards Research Committee