found some links on them that may help
http://www.vikingsword.com/vb/showthread.php?t=8177
http://www.vikingsword.com/vb/showthread.php?t=5298
http://www.christies.com/lotfinder/L.../d4576136x.jpg
Artzi ( always a great source ) had one similar that he ID'd as a Piso Gading,
I thought gading meant ivory
so I may have been wrong we will see where the discussion goes
http://www.oriental-arms.com/item.php?id=3216