I’m very grateful for everyone’s replies. I believe I’ve found a buyer here on the forum and as tempted as I am to keep the sword simply as an unusual piece I am more happy to get it into the hands of someone with a more specialized interest in collecting 19th and 20th century Japanese militaria than I have.
The most recent owner of this blade was the grandfather of my college pal who I later joined the army with. His grandfather was an irascible old fellow who had come to the United States as a refugee from Poland in 1939. He subsequently wound up in the US army. Naturally as a fluent Polish, German, and Russian speaker the Army sent him to fight the Japanese in the Philippines, an experience he did not enjoy in the slightest from what I gather from his reminiscences about those days. I wish I’d asked him where and under what circumstances he procured this sword. Among other things after his death his grandson and I learned he had been born Jewish despite never speaking about his family origins and claiming polish Catholicism for the last 60 years of his life. Interesting character...