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AlI can confirm the Campos. I have one but it is only an SCG 50 ( diamond cut).
I agee with significant color variation on Boone. On Glaviano, the Cardinals logo is yellow or white. On Kretlow the background is yellow or tan. Same for Wehmier. I am told Crandall can be red or orange, but can not confirm. Goodman is blue or green. Zernial is green or gray, Noren too. Meuller is blue versus greenish. I am sure there are more. I do not have all the red versus black backs yet. The differnces are likely similar to the gray versus whiteback shadings.
I am surprised the Mantle front variation is not given more notoriety