I WOULD NOT CALL THIS A MANDAU i AM SURE IT IS SOMETHING ELSE. UNFORTUNATELY I DON'T KNOW WHAT BUT I SUSPECT THE MEMBERS WHO SPECIALIZE IN THESE WILL BE ABLE TO TELL YOU WHAT IT IS.
IT LOOKS LIKE A VERY WELL MADE OLD BLADE AND COULD BE FROM BORNEO, MALAYSIA OR INDONESIA
A VERY NICE BLADE PERHAPS YOU CAN FIND A PROPER HANDLE AND SCABBARD FOR IT. YOU MIGHT BE ABLE TO FIND SOME INFO IN VAN ZONNEVELD'S, TRADITIONAL WEAPONS BOOK. CONGRADULATIONS
