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There is probably some reasonable explanation why the original yellow with black numbers plates would have been replaced with the newer black with yellow numbers plates.
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I am pretty sure that all cars with yellow CA '56-'63 plates had to convert to the new black '63 CA plates when they were introduced. In '70 when the new blue plates came out that requirement was dropped.
So, in 1963 this car would have given up its original yellow plates for black plates.
Just funnin' Bill, you know that!
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