Here's a couple of favorites. Probably one of the most iconic Longines pocket watches next to the double face. The pocket doppia lancetta. As others have posted, there seems to be two categories; one is the start/stop/reset type with a button coaxial to the crown, the other is a flyback with the reset only button off to the right side.

Can you see the start/stop/reset version is a copper bases alloy movement?

These are scarce and interesting.