It's.. all I can remember about it really it that it didn't have so much of a blade as much as this clear.. glass-like front? Like a huge crystal hook?
I've found a few Pre-Searing and around Old Ascalon area, so I'm thinking they can spawn anywhere, albeit they are very very rare. Please do correct me if I'm wrong.
Yep. I've seen swords called "Broadsword" that looked just like that. Some in pre-searing.
Had none of the nifty stats of the one in the picture, though, of course.