What is exactly a WT watch ?
Even if the watches of this thread are fine, we can't call them all "World Timer".
For me, a true World Timer is a watch with which you have the simultaneous display of the time of the 24 timezones without operating the crown. This requires a hours disk independant from the timezones one.
The most famous WT watches come from PP, GP, JLC etc...
But for example, this Lange is not a World Timer, it is a complex dual timezone:

Fr.Xavier