Hello David, While I cannot help much on direct information on this very unusual piece there have been a few more like items discussed before on the forum. Here is a link to a thread started by ThePepperSkull that shows a couple more of these sabres ?
http://www.vikingsword.com/vb/showth...ght=moro+sabre More detailed photos showing where the blade meets the guard/gangya would also help. Nice find and a very rare sword. Are you the lucky new caretaker of this piece?
Best,
Robert