Tri Compaxes Missing 'SWISS' Signature

Welcome to the sub forum Banders.

You would need to see all of those examples (where swiss is not visible) without the bezel to verify if swiss is there or not. One of them was mine (the 12296) and I think it had swiss but was just covered by the bezel, but I'm not 100% sure.

In any event you will run yourself in circles trying to come up with rules that UG ALWAYS follows. If there is a particular dial you are considering that is not signed swiss, I would focus on that dial and not on generalized rules, unless you just like academic research, which is cool too, and always appreciated when shared here on the forum.

All the dials in this thread so far are original.

In general I would expect to see swiss, but I would not assume it's an absolute rule, which would require extensive research to establish. I would be surprised if the attributes you are seeing on potentially non swiss dials are consistent, it could be instead you are seeing attributes for swiss dials that are hidden by the bezel (offhand it appears all the examples you posted are oversized gold cases?). In any event it's still a pretty small sample size.

Anyhow carry on, and please keep us posted, it's a cool research project. 👍

Have a read here before delving further if you have not already done so. +1 on what @bgrisso said. Welcome to the rabbit hole.