Most likely you're describing the Kanabo.
Yep!
Most likely you're describing the Kanabo.
As for that Oni, I saw that same show on Spike TV. a lot of fun, but give me a break, many things were way way off especially that thing. The claim that that weapon (a very common type found all over the world including Europe) was 15 let alone 30 lbs which they guy claimed right before they tried it out on that equally silly fake 1" thick iron-banded shield mounted on an inflexible steel bar... I don't know if you noticed the little studs flying off the 'oni' in the slow-mo shot that was pretty amusing. The real historical weapon probably weighed 6-8 lbs at the very most, probably more like half that.
G.
My only familiarity is with claymores (and I've seen an estoc, but that's a corner-case sword used for taking knights off horseback). So my knowledge of handed sword weights is a little skewed (I assumed anything lighter would be a bastard sword/hand and a half sword).
Interesting ceremonials would be heavier than battle weapons. You'd think a heavier weapon would be better for resisting wear and tear and a ceremonial lighter because its not cleaving through armor and flesh. Eh, you learn something new...
I did see the studs flying off the Kanabo, obviously not well made.
But given the dimensions of the thing, 10lbs-15lbs is probably not too far off. My bokken is about 2lbs, and its only about 3' long and 1 1/2" thick at its biggest.
It was tapered solid hardwood, somewhere around 5'6" long, with at least a couple of pounds of iron on it. At the top, the weapon seemed to be about 4"-5" across. That is a LOT of mass.
(I will grant you, though, the idiot who said it felt like it was 30 lbs had NO clue.)