You should see a strand of 3-5 numbers, usually with the word "DATE:" next to it. Those numbers are the Date Code, The 1-3 Numbers are for the day of the year, and the last 2 numbers are for the year the vacuum was manufactured.

I've circled the Date code on this picture of my XL2 , The same as yours, except in white. In my Case, My XL2 Was manufactured the 30th day of 2002.

(Please excuse the filthy bumper- It's been sitting in the garage waiting for Spa day!)

By the way, That bag holder (The plastic thing at the bottom of the bag) would no appear original to your model, As The XL2's Came with rounded off bag holders.

-Alex.