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dennisthe white backs are fairly common in the first series (up to about # 100) after that they are much harder to find than the grey backs. so if someone wanted to put together a master set with all variations they would be willing to pay a premium for the white backs. i put my set together over 15 years ago and just bought 1 of each card # and i have only 2 white backs after #100.i paid no attention to the backs. so i would say just stick to getting 1 of each # first, as the white backs will indeed be hard to find and will cost you more.