Early '69 production I believe is most common for the texture there,then it soon transitioned into the smooth grip.
Wear can take a toll and make the grain wear down,so you have to look close to see it sometimes.Both were possible during '69.
By 1970,smooth grip design was all across the board I believe.
I've yet to see a 1970 car installed with a '69 textured rim as I call it.
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