Found this interesting photo that shows the space traveler wearing both the Speedmaster Pro 'classic' and the Speedmaster Pro 'X-33' at the same time, one inside the spacesuit and one outside the spacesuit.
The classic is rated for EVA but the X-33 is not. Not that they are going EVA. Once fully dressed they can't see the watch on the wrist. I know for this most recent (accelerated) flight to the ISS, they had to stay in their pressure suits for the whole 20 hours rather than being able to take them off for what is the normal lengthy 2-3 day orbital rendezvous. This maybe saves having to change straps too. Most don't wear the classic while on the ISS - G-shock/X-33/etc - nice to have an alarm/timer/etc.
It's become quite common for cosmonauts and astronauts launching to the ISS on Soyuz to wear their X-33s under and Speedy Pros over their pressure suits. See one of my previous posts:
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