How did you determine that it's from 2003 (from your thread title)? Does it have a tang stamp like this:
Buck
110T
U.S.A.
That would be the stamp found on a 110 from 2003 unless it was from the Custom Shop. In the case of a Custom Shop knife the tang stamp would read:
Buck
Anvil (not the word anvil, but a stamp of an anvil)
Custom
U.S.A.
If the blade is anything other than 420HC, it would be stamped or etched with the steel type. If it's from the Custom Shop and is 420HC it should be stamped on the other side of the blade with "Designers Choice".
Another possibility is that it was a special run for some company exclusive for them (such as Smoky Mountain Knife Works), in which case it won't show up in Buck's catalog.
The Chairman series 110 wasn't introduced until 2011, so if the 2003 date you mention is correct, it can't be one of them.
As JK said, a picture or two would be a great help in identifying the knife.