so for the example provided, November 1966, 11A car with A638...
"It also explains the 282, 282 nd. body started that day. My 11A LOS built Coupe has
A 638, meaning it was built on the first day of Nov. in 66, it was the 638 th. Body started on that day.(all Models)"
Since the 1st of November is a Tuesday, the first day of that work week was actually the 31October. Does the A638 actually refer to the 638th car on Tuesday? or the 638th car of Monday (31Oct)
Basically the question boils down to how the 'weeks of a month' and production days within a week or month are defined.. Maybe JohnZ knows the answer to this?