Here's a link to a copy of the letter from General Larsen to my Dad about the sword. General Larsen brought the sword back from Guam with his personal effects and sent it from San Francisco in 1946 (the original of this letter is in the Center for History in South Bend Indiana along with all of my Dad's papers -- I made and kept scans of everything):
https://www.box.com/s/kyl87iday6scbhufl126
Given the consensus that this is an oil-forged blade, should I be afraid of lightly polishing it with a sword polishing kit? Should I clean (and if so how) the other metal fixtures such as the hand guard?