These cards are likely from the late 1970's. Kelloggs made cards that I have heard of from 1972 or so up until 1979 or so. They are worth most still sealed in opened packs, but in top condition even opened, the Willie Mays may be worth like $10-$20 is my guess. You can find out more on Ebay if you want, or post about it at a card site (I have one in my signature link which I own and operate). Type Kelloggs Willie Mays in Ebay, I am sure you will find something. Hope you read this because this will help.
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