Interesting part haven't seen before. The cam lever is cast. Like the early T's. Most are stamped pieces, guess this one was made in late 1917 and then the part changed.
I've got an early cast cam TT brake controller shaft as well, although my mounting brackets and pull levers appear to be the usual styles. Nice find.
Interesting that the parts book lists only the shaft and the speed lever as TT parts.
I had looked at that part listing too, that #1134 is the controller shaft and speed lever together. The #1133 being the riveted on upright speed lever that is taller for the TT, as the TT frame has much taller side rails, and I wonder if the controller shaft curved down loop I is different too? Maybe the angle of the torque tube as it goes to the top of the rear axle?
Don't have both parts to compare that loop.
Had a friend check his TT controller shaft to a car style, the curve is the same. So only TT part difference is the taller speed lever.
Correction to last post.
That early TT controller shaft indeed has a deeper curve that the later TT or T controller shaft!
Here is photo of later TT controller shaft (tall speed lever) on top of the early one that has the cast brackets, you can see the deeper curve of the early style on the bottom.
And again, the end of that early controller shaft with the early cast brackets and cast arms, showing difference with the later version on top.