it's most likely SD0057
and for the year 07, they changed the date code to reflect week and year instead of how it used to be which was month and year.......so your bag was made in the 5th week of 07, so most likely in the very beginning of Feb.
hehe, my post in is the background on your comp screen!! Oh make sure you check the handles. I got a manhattan and the handles were totally off centered and out of whack!!