AN-09-04 to FN-09-04 series

This series has AN-09-04 to FN-09-04 printed in the lower right hand corner, followed by either a blank,
or a series of letters always starting at "I" then descending in sequence to "A".
Once "A" is reached, a series of numbers always starting at 9 then descending in sequence to 1 follows.
Earliest known date: 04 APR 05.