Something that's often referred to as a "glaive" in the mac-bible, but really isn't, is this very interesting thing right here:
Unfortunately I don't know of any surviving examples. Much like the "choppers" depicted in the same book, I don't think any still exist. But these show up quite frequently, and in a variety of proportions.
I contacted A&A about making one, and we're working out the details. It's going to cost as much as a sword, but it will be a very cool and unique item to add to the collection.