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Don't look to toning as a "factor of interest" as to rarity. Toning has no effect on price of a common coin, unless its REALLY lustrous or rainbow toned. The coin of interest probably has just started to tone back to brown; nothing special there.
Still a neat look to that coin in your avatar; just because it isn't worth money doesn't mean its not interesting or cool.
Many of these had a brass type color, some even say they are brass or yellow Many of these had a brass type color, some even say they are brass or yellow cents. Thus is most likley a wash or rinse type of planchet coloring error or the planchets were left in the plating to long. The patina you see is most likley a result of that. There are other years this happend, 1985, 97 98 to name a few. If you want to learn more search this forum for Brass Cents or see Ken Potters website.