Hello Folks, I am sorry it took me so long to reply, I would like to add some meaurements, a photo and a opinion or two.
Hina Katana: OAL: about 38.5 cm Nagasa: 26cm Nakago length: 10.5 cm Nakago kasane @ the shinogi: 4.8mm to 3.1mm
Nakago Haba: 18.4mm to 15.4 mm Weight: 145 gm.
Now for comparison A tanto of mine. OAL length: 35.5cm Nagasa: 25cm Nakago Length: 10.6 cm Nakago kasane: 8.6mm to 5.1cm Nakago Haba: 22.6mm to 13.7mm Weight: 255 gm.
Now please take note of the weight of both swords. The tanto is almost twice as heavy; Why is that? IMHO, the tanto was made for combat, not so for the hina katana , but then again the intended recipient was way to young for combat. Also it seems to me that the NBTHK put these little swords into thier own category so as not to me confused with other swords. Thanks for yor intrest. Mark Pederson.