bikeman - welcome to the forum. Here is a great link with samples of cards from each tobacco issue:
http://www.oldcardboard.com/cardSetList.asp?GroupID=2
T204 are square with an ornate gold border.
T205 are rectangular (1-7/16" x 2-5/8") with a gold border.
T206 are the same size as T205s but with a white border.
See here for visual identification of tobacco cards:
http://www.oldcardboard.com/t/t-gallery.asp
We'd also love to see scans of whatever you found.