the last 4 digits on line 5 are date stamps 24 hr & 100 minute (is there about 1.5 hrs difference between the 2?)

St. Louis for '70: the sequence numbers (is one "B" & the other "C"?) are the back & bottom (or vice-versa) of the rear seat & appear to be the assembly line sequence number of those components (possibly each in/on their respective lines).