What expertise I have is strictly limited to '64s, but this thread caught my eye.
I do not know for sure, but I believe Fremont changed the style of Data Plate they were using precisely between the week your '66 Body Assembly was built (1A) and when the one Chris posted (01B).
This was nominally true for Fremont built Chevelles that same time frame although the early Chevelle plate included the "Magic Mirror" paint statement that is missing on yours.
Since repro Data Plates are easily obtained and often (from what I've seen) produced on "wrong" style blanks, if it was me I would research other early built Fremont '66s to confirm what I'm saying.
It would have nothing to do with the "SPEC" paint and everything to do with the style of Data Plate Fremont was using early year vs. late year.
Same thing happened during the '64 Model Year, a change in the Data Plate style at one or more of the Tempest Plants. IIRC, I recently learned that KC used an early, then a middle, then a late style plate for Tempests in '64.
It is conceivable that the early Pontiac plates at Fremont lacked the "Magic Mirror" statement even while the early Chevelle plates included it but I would research it to be certain.
The later Chevelle plate was identical to the Pontiac style for the one Chris posted.
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