No one mentioned William Larue Weller...thought it was SW too.
The old W.L. Weller 19 was/is. The 2005 Weller wasn't (distilled in fall 93), and the 2006 Weller probably wasn't either. While the 2006 Weller was distilled in spring 91, and theoretically could be SW, the info sheet reads identical to the 2005 Weller sheet which would lead me to think it is BT. (All this info coming from the fact sheets so graciously posted on this board!)