I added a summary to the first post of this thread.
Here's the updated compilation. 67 has a calendar week code. 16 D 7 would be the 16th week of 67, day shift. 40 6N would be 40th week of 66, night shift.
The format changed in 68 and 69 to have the week counted from the beginning of the model year. The extended 69 model year used tanks dated for the 70 model year.
11A 40 6N
?? 52 N 6
02A 5 N 7
02C 5 D 7
02E 6 D 7 (stamped 7D6)
03B 9 D 7
03C 11 N 7
04B 4 N 7
04D 5 D
05C 16 D 7
10E 7 5 N (7 may be a 2 and 5 is upside down)
11C 68 17
12D 68 20
01C 68 19
02C 68 27
02D 68 32
02E 68 32
03C 68 34
04A 68 37
05C 68 42
05D 68 44
07C 68 52
07D 68 52
07D 68 53
09B 1 69
09B 1 69
10A 6 69
10C 4 69
10D 10 69
10D 10 69
11D 14 69
11D 15 69 (stamped 69 51)
11D 16 69
11D 17 69
12A 16 69
12B 17 69
12C 16 69
01B 21 69
01C 21 69
01C 22 69
02A 25 69 (upside down 5)
02C 26 69
02D 28 69
02D 29 69
02D 29 69
02D 29 69
02D 29 69
03B 29 69
03D 45 69 - replaced?
03E 33 69
04A 33 69
04B 33 69
04C 37 69
04C 37 69
04C 37 69
04C 37 69
05A 37 69
05E 41 69
06A 41 69
06A 42 69
06A 45 69
07A 48 69
08A 1 70
08C 2 70
09A 5 70
09C 5 70
10A 9 70
10E 12 70