[Mark_C]

LA built cars have a w/o number stamped on the lower right corner of the trim tag that consists of a letter and three digits like I520. It is how LA kept track of car bodies inside the plant. The letter is equivalent to the bay the body was scheduled to be built and roughly corresponds to the day of the month in this case I = the 9th working day of the month, and the digits equal the 520th body scheduled to be built on that day. Note that the build day letter does not always correspond with the calendar day, ie the A build day is not always the first working day of the month.