California added the Black 63-69 plates to the YOM program here about 2006. In California you can have a 63-69 Black plate still on a car and not pay the extra $10 YOM fee...
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Or you can pay the fee and look cool...
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Unless you look at the registration you cannot tell, they even require you to have the correct year tab on the plate when you get them added. On all the pre 63 plates they give you a tin flag to put your stickers on, with the 63-69 plates everybody just puts the stickers over the old ones (although you are suppose to use the tin flags).
Alan