I've been slacking with my posts. I have been keeping busy with other tasks, and I am thinking another "commercial pursuit" is in order!
In the meantime, I have been doing some more beef-related research. I stumbled upon a website where people can put in a request to find "lost recipes." On it, I found this thread that discusses a beef (or turkey) "commercial" sandwich. It is interesting that they mentioned the variations (open face, bread on top), as I have observed this as well.
Also in the above listed link, there is also another link to a recipe to make your own homemade beef commercial. (There is also a photo of the finished product...Mmmm, looks great!)