Another hint:
Some time ago I posted this Yataghan:
http://www.vikingsword.com/vb/showthread.php?t=4728
and thought it had a Karabela handle.
I was corrected, however, by several Forumites. This is the so-called North African form of the Yataghan handle.
However, look how similar it is to the "eaglehead" configuration!
I would say the N. African handle was a local modification of the Karabela one. Any disagreements?
Another area of Ottoman influence, and no connection with Persia!