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Originally Posted by Rocky Rotella

GM assigned production weeks a bit differently that one might assume.

While it would seem logical that 07A would represent July 1-7 and 07B represents July 8-14, GM actually assigned them by weeks in the month. During July 1976, The first fell on a Thurs, so 07A would represent July 1-3. 07B would then represent July 4-10, and 07C for July 11-17, and so on. I believe they considered a seven day week from Sun-to-Sat and not from Mon-to-Sun, but even if they did it would simply shift the dates by one day.

So to your question, your 07C build date would correspond with a July 14 ship date.

Thanks Rocky