So your saying that there are 2 weeks worth of 08A cars out there? What I still don't understand is if you look at the calendar for the year 1969, August 1st was a friday, so it seems odd they would have been on top of their game to change it for the one day, and then slacked off the whole next week and left it as 08A. Seems like it would have made more sense for friday the 1st to be an 07E cars, and the week starting August 4th to be designated 08A, and then then next 08B and then 08C and end the last week of the month with 08D.
This also makes me curious did they also have 03E for cars built only on March 31st, or I would suggest 06E for cars built on June 30th, but I think I saw that all june cars were 06A, (was that for the same reason they forgot for the month of june?)