For me, and maybe I have a different Naming of the Pallweber type I and II and
III but I think, I reproduce, what I understood, what is written in the books
of Meis and Tolke/King is the following:
The type I ist the first Pallweber from IWC. It has two characteristics
visible from the back:
- There is a flat spring to push down the wheel with the missing teeth. This
spring is mandativ for the type I, as the axle of this wheel has no fixed end
under the dial, becaus there is a star to move the minute directly rotating it
in clockwise direction. You can see nothing but the plate under the wheel with
the missing teeth (intermediate or 3rd wheel =Kleinbodenrad in German) ->
upper part of the picture below.
In the type II Pallweber they wanted to get rid of the spring and have a
"watchmaker" solution to have well positioned axles with the wheels. Here just
under the 3rd wheel an additional pinion to drive an otherpinion under the
dial with a "star" to drive the minutes disk (in the other direction than for
type I).
So there is no spring (maybe a hole for the spring is there but not used,
because the type I plates with drilled holes where finished als type II,
becaus the type I movement was most probably not working properly) and there
is a visible pinion. -> lower part of the picture below.

Finally the type III then got the quite big and well known star underneath the
3rd wheel. (and here the minutes wheel is also driven counterclock wise via a
pinion the discs)
Kindest Regards watch77