1955 Bowman question any premium for color var?

I have a stack of 55 bowmans and some are bright brown bordered and some are light brown. Is this a variation or a unlisted printing error?
USN 1977-1987 * ALL cards are commons unless auto'd. Buying Britneycards. NWO for life.
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1955 Bowman Raw complete with 90% Ex-NR or better
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