I've taken some photos of my Model F XT, including a second sticker with lots of numbers.

Here is another sticker that was underneath the board.

Made an interesting discovering though about the barrels...
Certain mold series (e.g. P) are distinctly better than others, in terms of key feel.
The barrel is more smooth, and the top edge is more rounded.
On my board I had mostly A's, but about a dozen P's.
P12 is distinctively smoother than A12.
http://lh3.ggpht.com/_6WOoTO_7VuQ/THB6jG82ctI/AAAAAAAACCw/h7-BZPjJZIk/s800/2010-08-22%2009.24.36.jpgOne on the bottom is P12, all P molds have that distinctive shiny ring around the barrel.

Bottom one is P12.

Top one is P12. Notice that the molding artifacts are different.

I haven't done the same comparison on my Model F AT, but I will in the future some time.
Oh and this connector on the Model F XT is just cool:

Here are the rest of the
photos.