Thank you all for the responses! He was at Saipan & Tinian, then became part of the occupation in Japan. There is not a tassel, unfortunately. I do notice some scratches consistent with repetitive slashing, so it may have been used in actual combat, or possibly as a machete (not sure if that would have actually happened, just a theory), but there aren't any chips, rolls or nicks along the edge. Again, thank you all!