I think I saw some photos, maybe in this book
http://www.amazon.com/Bowie-Knife-Unsheathing-American-Legend/dp/193146412X
Bruce,
I came across this site that has a Will & Finck push dagger. The pictures are pretty poor, but you'll easily get an idea of the design and some of the embellishment.
Link: http://shcivilwarantiques.com/catalog/antique-bowie-knife/
Nathan