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Actually, your tanto is signed, “Bishu Inuyama ju Michiaki [尾州犬山住道暁],” instead of “Michiyoshi [道賀]” (who was a student of Aizu Michitoki) you mentioned. According to my reference books, there were a few smiths who signed “Bishu Inuyama ju MichiXXX” in Owari province at the end of the Edo period. I believe they were all related smiths in the same family or school. However, I cannot find any specific information about Bishu Michiaki other than that he was active from the Bunsei through the Genji eras. Since the date inscription says “August, the 3rd year of Keio,” the blade is probably one of the very last blades made by Michiaki. (Though I could not find any oshigata of Michiaki's mei, chances are that the mei on this tanto is shoshin because you hardly ever find any gimei of a shin-shinto period "nami-saku" smith anyways.) Dr. T
Dr. Stein I see... If my memory serves , there was a thread on Takayama-to/Kozan-to brand stainless steel kaigun-to over at SFI years ago... The condition of nakago in your photo looks very much like the one in the old thread...
Okay, here is what I was able to dig out on Tadakatsu. Tadakatsu's real name was KOKETSU, Minoru. He was among the 232 gunto smiths worked in Seki Tanren-jo Co. during WW2. As you may already know, Seki Tanren-jo Co. was a forge created as a subsidized company by the city of Seki in Gifu Prefecture (old Mino province). Their aim was to boost the city's severely declining economy by participating in the "Tan To Ho Koku [serve the country by forging swords]" pro-war movement that started right before WW2. According to the official record compiled in 1944, Tadakatsu officially joined the forge on May 7, 1943, and worked as a gunto smith till the end of the war. Unfortunately I don't have any other information on this smith, thus whether or not he was actually an Army Jumei Tosho that also produced real gendai-to is unknown. Since I could not find any other information on Tadakatsu in any of my reference books, my guess is that he was not an official army jumei tosho but was merely one of the Seki smiths who had mostly been making kitchen knives and carpentry tools before Seki Tanren-jo Co. opened... Of course, that does not mean that the particular blade in your possession is a mill steel, oil quenched Showa-to of inferior quality (which will not be considered as a true Nihonto under the current Japanese laws). Actually I can see from the photos that the particular blade would probably be considered a true gendai-to (by the legal standard of the Japanese Customs) and be appropriately registered so, if ever brought into Japan. Contrary to an old misconception still perpetuated amongst Nihonto collectors in the Western world, today's Japanese officials (who are commissioned by the customs to examine/determine if a blade to be imported into Japan is a real Nihonto) are better educated on Showa era gendai-to and interested in preserving them. So if you use today's more lenient standard held the Japanese officials, the blade should be considered a real gendai-to that can be registered in Japan. (Though I doubt if the blade would pass NBTHK's Hozon shinsa like the blades made by Emura and Ichiryushi Nagamitsu...)