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Charlie,
It seems to me that the grey color was about as neutral as it gets. It wouldn't detract from the color picture and sort of blended with the gray color of the picture tube when the set was turned off. It also harmonized with most any cabinet finish. Perhaps they went to green when the dark tinted tubes came along to avoid a sharp contrast in color between the greenish tube face and bezel. The green also seemed a more up to date color for the 60's era sets.
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