My question to you good people is this: Could this be a broken pommel from a dueling sword?
It seems to be made of bronze (by my lack of knowledge). It is heavy for its size and being hollow. On the visor of the knights helm are the letters K P. When viewed from the top, the eagle's back seems to form a distinctive cross shape, and there appear to be slight hammer marks on the eagle back (where the pommel was peened?)
Enough of my pondering, let there be pictures!


A front view


A side view


A shot of the "cross" and hammer marks