THE CLOSEST I HAVE SEEN TO THESE KNIVES ARE FROM CAMBODIA. THEY HAVE ANTLER HANDLES AND ENGRAVING ON THE BLADES BUT WERE NEWER. THESE ARE OF MUCH BETTER QUALITY AND OLDER EXAMPLES AND MAY BE CORRECTLY IDENTIFIED AT LEAST THATS WHERE I WOULD START LOOKING FOR REFRENCES.
CAMBODIA, VIETNAM, LAOS ECT ARE IN THAT REGION WHICH USED TO BE REFERRED TO AS INDO-CHINA AND THERE ARE A LOT OF SIMULAR TRIBES THRUOUT THE COUNTRIES IN THE REGION. THERE ARE SOME OLD FORUM POSTS ON THE CAMBODIAN EXAMPLES FOR COMPARISON AND IT IS LIKELY SIMULAR KNIVES WERE FOUND THRUOUT THE REGION IN VARING QUALITY AND VALUE. YOUR EXAMPLES BEING OF THE MUCH BETTER QUALITY AND CLASS. THE DIFFERENT BLADE SHAPES MAY INDICATE THEIR USE OR NOT
BUT THEY SURELY INDICATE THEY SERVED A DIFFERENT FUNCTION OR SHOWED A DIFFERENT INFLUENCE IN DESIGN AND DECORATION. GOOD LUCK
