I have at my house a very similar 10.75X68 TypeB which belongs to a friend.
It has the same barrel which is interesting in that the muzzle is the same diameter as the banded muzzle on my other B and my TypeA! A very stout barrel indeed!
Also, as if the naysayers of dovetailing the front ring weren't in shock enough, they dovetailed the barrel breech for the claw mount instead!! Not much meat there!