PERHAPS IT IS A VARIATION FROM A DIFFERENT GROUP IN THE HADENDOA TRIBAL GROUP.? THE ANGLE OF THE BEND IS A LOT SHARPER THAN I HAVE SEEN ON ANY OTHER EXAMPLE (NOTE THAT IT FORMS AN ACTUAL POINT) AND AS POINTED OUT I HAVE NEVER SEEN A BLADE WITH ENGRAVED DESIGNS. THEY ARE USUALLY PLAIN ON THE OLD AND THE NEW ONES AND I HAVE SEEN MANY OF THEM.
THE BLADE DOES APPEAR TO HAVE SOME AGE SO I WOULD GUESS IT IS NOT A MODERN MADE ONE , MADE TO APPEAL MORE TO TOURISTS, SO THAT WOULD NOT ACCOUNT FOR NEVER HAVING SEEN SUCH AN EXAMPLE BEFORE.
NICE CATCH AT A VERY GOOD PRICE.