This is my most recent purchase. The kanmuri otoshi blade geometry is what drew me to this piece. The sword is signed Taira Nagamori and has a NBTHK Hozon token. I'd be interested if anyone could translate some details of the NBTHK papers. In particular, I'd be interested to know if the NBTHK assigns a generation or era. Sesko's A-Z lists at least four smiths in Bungo province signing "Taira Nagamori" in the mid-late Muromachi, with the third generation working during the Eisho era being the most well known. Also, I have a copy of Bungo Taikan/Zusetsu Bungoto, but no English index. If anyone has a .pdf index that they could send me I'd be greatly appreciative.
Nagasa: 71cm
Sori: 1.7cm
Motohaba: 2.69cm
Kasane: 0.8cm (the sword is a full 0.95cm at the widest part of the nakago -- must have been a beefy blade at one point)
The hada is itame with nagare and o-hada, ji-nie, and shirake utsuri. The hamon is based on hoso-suguha mixed with midare in nie-deki. The hamon shows activity including ko-ashi, nie-kuzure, sunagashi, and yo. The boshi shows hakikake.
This sword previously was sold some years ago by Aoi Art so I included their Oshigata and hamon photos with my photos. The tsuba had been swapped at some point in the intervening years and it came to me with a modern reproduction tsuba. I swapped the repro for an antique signed "Bushu ju Masanori" that matched the floral theme.