Cato shows two excellent examples on p. 51 of his book Moro Swords (Figures 31,32), one bone-hilted and the other a superb ivory-hilted example that resides in the National Museum of the Philippines. Those two examples and the one above are typical of Maranao work from the Lake Lanao region.
The hilt of Pinoy's example shows a grain most unlike elephant or marine ivory, but is consistent with bone. Whale bone is a good possibility.
Ian.
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