KRIS #4 POMMEL IS DEFINITELY NOT RHINO HORN WHICH IS GOOD AS CUSTOMS WILL NOT BOTHER YOU.
THE LAYERS YOU SEE IS WHAT IS FOUND IN CARABO AKA WATER BUFFALO HORN. THIS LOOKS LIKE AN OLDER PIECE DUE TO THE WEAR AND CRACKS. THERE IS A GOOD POST IN THE FORUM WITH PICTURES THAT CAN HELP YOU LEARN TO SPOT RHINO HORN. BUT ALL RHINO AND OTHER MATERIALS CAN VARY IT IS SOMETIMES DIFFICULT EVEN THEN. I REALLY CAN'T TELL ON THE INLAYED PIECES ON THE SCABBARD SOME SEA TURTLE SHELL CAN LOOK LIKE THAT IF IT IS OLD THICK AND UNPOLISHED BUT SO CAN A THIN SLICE OF HORN. THE INLAY IS INTERESTING USING MOTHER OF PEARL, HORN AND SOME RED AND BLUE SUBSTANCE. LIKELY THE SCABBARD WAS DONE AROUND WW2. SOME OF THE MORE KNOWLEDGEABLE PHILIPPINE COLLECTORS WILL LIKELY BE ABLE TO GIVE YOU MORE INFORMATION.