I'm going to be a bit blunt on this matter. Please don't take it personally, since I have absolutely nothing against you, and if anything, enjoy reading your posts on other matters.
That ninja-to style bokken is not going to last very long at all.
Given it's price, I'm almost certain that it was made with a very porous grain red oak slab. If you stripped off the black paint and the varnish, then you would see all sorts of wood fillers used to fill up the gaps in the wood.
There are many kinds of wood that will be far superior, and that bokken made from the better woods are going to make you a happier practitioner. They may cost more, but in the end, it's safer, since you don't have to worry about splintering bokkens to nearly the same extent.
These bookens are made to last and resemble a
fuedal tachi. I have a bunch of them and they will
probably last longer than me. http://www.pennsylvaniabujinkan.com/Dojo/New%20Equip.htm
These are built to last a long, long time and will
really give you a workout.
So true. The Japanese never made a straight blade like that. Many "Ninjas", when they actually go to Japan, find that out. The movies and the Ninja boom in the early 80's created the "Ninja Sword".
I know you meant there were no ninjato that match the short straight bladed, giant square tsuba'd design mimiced by that bokuto, but perhaps all readers may not. Even the ninpo guys use more standard katana style weapons.