How about this piece of paperwork ? It is a Quality Control Sheet showing a problem with the paint or stripe. Has the last 3 digits of my trig tag build number and paint code QQ. A different sort of documentation for a GSX. Found up on the inside pillar post area, driver side.
I use to work in a Auto plant paint dept, we still used sheets like this to show defect and area and stamp for confimation of repair. Wonder how common these sheets are to find? I have never seen one still in a car. What plant was car built?
No...not common to find any documentation, and this isn't among what is found. Considering percentage of cars pulled offline for correction, percentage with sheet left in, percentage with sheet surviving almost 50 years unmolested...not to mention it's an X...rare indeed...
Dynaflow is right - It meant there was a problem so you would hope these were rare. From the position of the marks, it looks like an issue with the stripe. Since the car was taken off the line to have this repair, what would that do to the build number ? If my car was #644 to be built with two after it on the line, would my car still be recorded as #644 GSX or #646 GSX?
There were offline stations at both Fisher and Buick to handle issues found during build process. Cars were re-inserted on lines after correction. Since yours was front end sheet metal, that would have been Buick. They didn't always come off lines in numerical order. Body and Sequence Number (last 6 digits of VIN) determined how they were built, not when.
And to add to these thoughts, the GSX stripes were added after final assembly, generally during the night shift when most of the line was shut down. They were never applied at Fisher Body or during the normal painting process at Buick Assembly.