I am stumped and would value everyone's input as always. I am looking at an older blade mounted on fairly nice WW2 Shin Gunto mounts, possible to buy (not listed on Ebay). Overall, the sword is mediocre. The thing that really got me stumped is that the sword is clearly hira mune. I look on the web ... nothing. I looked in Hawley and Yumoto's The Samurai Sword but nothing much is said. I looked in Nagayama's The Connoisseur's Book of Japanese Swords, and it defined kaku mune succintly as "a completely flat back edge seen only on ancient swords, also known as hira mune." The sword is clearly not that old. I'm trying to get the owner to send me pictures of the tang. When I get the pics, I'll post them. All I know at this point is that the sword is mumei. I know what I am giving you is pretty thin, but would the hira mune character give us any leverage on the sword's provenance? Please help.
BTW, nagasa is 26".
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