Wood chisel
Where do I get a knife like the one in this video?
https://www.youtube.com/watch?v=7RAi5zDnVGM
Your choice, You can go down to the hardware store and buy a good wood chisel and a large wet sharpening stone like what you would use to sharpen a knife or buy a replacement blade for a wood PLANER.
Then put a handle on it of some kind.
If you don't know what or how to do that and you don't know anyone who can sharpen a knife properly then ( I ) will go down to ( my ) local hardware store, buy what you need, sharpen the wood chisel for you and I ship everything to you for my cost plus 20 bucks for my time and shipping.
If I do it will run you about 55.00 to 60.00 bucks.
Wood chisels run about 20 bucks and Norton wet stone is around 20 bucks to.
But the wood chisels are not sharp enough from the factory and need to be razor sharp.
If you want a something sharp enough to cut a laminated tip ?
Ps macguy is correct that is a Japanese wood knife .
A American made wood chisel and a wet stone will do the same thing.
I do stacked leather on my Pocket Chalker's .
And that is what I use to cut all my leather.
Is there a saddle shop in your town or city you might pop in and see if they have any leather knifes.