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Richard MassonThere are two different variations including the color "blue." First there are the blue backgrounds (vs. pastel). The blue backgrounds have always traded at higher prices, but I have found a handful of the pastels to be tougher.
The second variation is in an individual series, where the cards in that series were issued with the backs in either blue ink or black ink. The "black backs" trade at a slight premium to the backs printed with regular blue ink. Tinker, Young, Waddell and others are in that series.