rednate,
You are right about that first character being a letter, and, it makes a difference (in terms of figuring out other dates codes).
My guess is, however, that the character is an I rather than an L, making the date:
I 29 9 = September 29 1959 (does that seem to be reasonable?)
I have changed that page. If you see any other mistakes, please let me know.
Thanks,
Tim