Also, a note on glass: You have an anchor bottle. Anchor glass almost always bears a 42, which is simply some internal code they use, and then the year. 1998, would be 98. At the very latest this was bottled in 1999 sometime. I don't know if UD was even using a printed Julian code at that time, and glass is the best way to tell (other than UPC). I'd bet your bottle has an anchor symbol somewhere on it.
The printed code is from Anchor. If you look at a bottle of Blanton's it'll have two codes, the BT bottling date and a code from Anchor that matches the date stamp in the glass. Other Anchor bottles have the printed date as well.
It's mighty nice of them to do... Wish other bottle makers would follow their lead.