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TBobI gave it a shot as well, but lost out on the card. It is not a variation, just a printing freak but still interesting. The color variations in the Obak sets involve the 1910 series' and are contained in the 150 back subset. I have the Mundorf on ebay now which is supposedly the toughest. Besides Mundorf, Willis, McCardle and Griffin, which are the most obvious and the Big 4 of the subset, there are subtle color variations involving almost all the 150 backs. Indeed, there are even color variations among the 150 backs as there exists cards of Krapp with 150 series backs which have subtle differences in the color and shading of his hat, etc.