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Getting back to when they stopped stamping the '63 on the plates....
I have some plates starting with X that dont have the '63...
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Interesting. I have a California plate, XPA 230, and it does have the 63 stamped into it.
-Jon
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Here are couple of plates- the top is from my 69Z28, bought from the original owner in 2002. 10C VN built, sold 11/30/68 at Hallowell Chevy in Clovis CA. It is the lowest letter sequence of any black plate 69 I have seen,and does indeed have the etched 63 in the right box. Below that one is a GM manufacturer plate assigned to "Chevrolet Motor Divison. 1800 Ave of the stars, Century City CA." Blank box.
I have seen some late Z sequence embossed and some without. DMV assigned letter sequence plates by counties, and there was a "West L.A. series" among others. Only a guess, but maybe the etched versions distinguished between northern from southern CA originated plates?.
Someone brought up the monthly stickers- California didn't adopt staggered registration until in 1974,but all black plate cars had to use them after that point..