Tim:
Tom has identified the knife -- it is a
hinalung from one of the Igorot tribes in Northern Luzon. The other form he referred to is called
pinahig. Both of these were discussed in an article on the old EEWRS and can be found here:
http://www.vikingsword.com/ethsword/ifugao/index.html
The open-faced scabbard is called a
hikot.
John has identified the lizard that is most likely represented on the sheath.
A full description of the item, with reference material, in just over 12 hours since posting. The resources on this site are pretty darn good!