Not pre-production, built in January of '65--not '64. It was ordered as a special DSO 84 with "show car treatment." So perhaps they did use a little extra paint on it and it is not a true representation of actual assembly practices at the time.
Another note might be that, as I understand, the Skyway cars were sent back (to Detroit???) and refurbished as needed, so hard to say how much may have or could have been done in each case-by-case refurbishing.
The thoughts I have are from my experience of 1984 after the LA Olympics. I worked at a Buick dealership (Buick was a major sponsor to the '84 Olympics) and many of the dealerships around the area handled the thousands of Buick Century's used for that event. They were given full factory warranty (then 12 month-12,000 mile) beginning on whatever the odometer showed at time of sale. EVERYTHING and anything was covered from cigarette burns to full interior replacements to full repaint if needed. It was a major undertaking on a few of them.
I imagine Ford did a lot similarly with all the Skyway convertibles they had refurbished, but I am sure Gary knows more about his particular Skyway car than the majority of the others that are long gone now, never seeing a restoration. This is one of those extremely unique details in Mustang History that a lot of information seems to have been lost or is undiscovered. uncirculated at this time. Gary's 65 is a REAL part of the "story" of Mustang.
Richard