This 23-card set features photos of the 1978 Seattle Mariners printed on 3 1/2" by 3 5/8" black and white postcard-size cards. They either have standard postcard backs or blank backs. The cards are unnumbered and checklisted below in alphabetical order.
Market Report| Title | SER # | PRINT RUN | LO | HI | Actions |
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| Title | MINT | NM-MT+ | NM-MT | NM | EX-MT | EX | VG-EX | VG | GOOD | POOR |
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| Title | GemMt | Mint | NmMt+ | NmMt | NrMt | ExMt | Ex | VgEx | Vg | Good | Poor |
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