I'd reduce the length to ~140 and thrust dmg to 28 (don't forget about heirlooming) to make it more balanced since it's a spear with good swinging capabilities, speed 92-93. Would be a really awesome weapon to have in the game, now if only someone could make it...
I thought the Shogunate might go for this type of weapon
So far, with the limited votes cast, I'd concur with a slight reduction (1-2 points) in both speed and thrust dmg.
The length is the same as the war spear, though this weapon costs roughly double. I'd still like to see it in the 150ish range, since the swing damage is quite low compared to other polearms (long hafted blade, poleaxes, etc.)