This came from the grandson of the Marine who brought this home. Exactly what "this" is still up in the air. The machete/short sword matches the design and measurements for a Spanish Model 1860 machete sword, used by Cuba's civil guard into the Spanish American War. The scabbard has the British broad arrrow and was made in Sydney Australia in 1943. They fit nicely together.
The machete's blade and overall length and basic pistol grip style are within specs for the Model 1860, but this one does not have the large brass pieces applied to the pommel like the Cuban ones have. The blade is stamped "No 1" and there are no other marks. It looks like the blade has been varnished or otherwise coated to protect it. It all has a nice patina.
The Marine wrote his name, rank and SN on the back of the scabbard, along with New Zealand, Guadalcanal and Bougainville.