Unusual Polearm. Thoughts on origin?

[RSWORD]

I would love to have thoughts as to the origin of this polearm blade. It is a nice, large example with beautifully executed fullers, a very interesting bump out on the spine chiseled with a floral decoration, and the remains of the ferrule, which makes a solid handle to grip and swing the blade now. The material appears to be copper or a copper alloy.

I am wondering if the decoration on the bump out portion of the blade points in any direction? This is where I think the origin lies but am curious as to thoughts on this one.