E Club. What is this golf club for?

Over the weekend, I was given a complete set of used golf clubs as compensation for moving a few tables. Here is the inventory:
[ul]
[li]Select Model 1D titanium shaft metal head with a good grip.[/li][li]Pinnacle 3 & 5 woods “off set”, metal head [/li][li]Hogan Radial 3-9 irons and an E [/li][li]Wilson Autograph PW [/li][li]a wedge of some sort, the bottom is filed off. [/li][li]Wilson Strata Bloc Uni Bond 3 & 4 W (wood heads) [/li][li]Wilson 3 W (wood head) [/li][li]Wilson Strata Bloc 5 W (wood head)[/li][li]Bag[/li][li]Cover[/li][li]Head covers[/li][li]a “shag bag”[/li]
[/ul] What is an E club? It looks to be a wedge of some sort, but if I have a PW and a SW, what would I use an E for?

http://www.pgaprofessional.com/askthepro_archive_2003.html#04-20-03

It’s a pitching wedge. That designation “E” appears to be used only by Hogan.