Sugata: Shinogi-zukuri, tori-zori, iori-mune. Quite a slender blade.
Overall length: 34.84 inches (885.00 mm)
Nagasa: 27.68 inches (703.00 cm) long.
Nakago: Ubu, I think, though if it is I'm a bit mystified by the placement of two of the three mekugi-ana. Alternatively it is o-suriage, and someone has spent an unusual amount of care, for the period, reshaping the nakago-jiri from the usual cutoff to kuri-jiri. If the latter is the case, it may indicate either someone respecting a well-made blade by a good smith, a wealthy patron with particular tastes, or both. Either way, the nakago is 7.17 inches (182.00 mm) long. The yasurime are difficult to see, but are probably kiri. The nakago shows sign of wear and past rusting. The rusting damage is so old that it has patinated. Certainly not recent, and probably preceding WW2 by a long way.
Kissaki: Chu-kissaki, 1.26 inches (32.10 mm). The boshi is ko-maru, as best as I can tell.
Moto-haba: 1.16 inches (29.50 mm). Moto-gasane: 0.25 inches (6.40 mm). Saki-haba: 0.69 inches (17.50 mm). Saki-gasane: 0.16 inches (4.00 mm).
Sori: 0.53 inches (13.400 mm)
Hamon: Narrow undulating suguha.
Hada: Difficult to tell. Possibly itame.
One blister, markers of tiredness such as potential grain openings, and markings on the surface of the steel that may indicate that the skin steel has been worn away in places due to centuries of polishing. However, whilst tiredness is a no-no for Shinto and younger swords, it is not the case for Koto blades, considering how many wars they have probably been through.
In WW2 shingunto koshirae, featuring an uncommon sukashi tsuba and a leather sarute.
A good example of somebody taking the family sword off to WW2. It may have a polish left in it, depending on a togishi's advice. It is probably worth submitting this sword to shinsa
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