Omega cased in Europe

As I continue learning more about vintage Omega watches, I took a closer look at one I bought some time ago and noticed the inside caseback markings. From what I understand, these markings suggest the watch was manufactured and cased in Switzerland rather than the U.S., since it doesn’t appear to have a case made by one of the American companies that Omega sometimes used for the U.S. market.
I’m curious what the group thinks—does a Swiss-cased example tend to be viewed as more desirable or valuable compared to U.S.-cased versions, or does it not really make much difference? Always interested in hearing the perspectives of those with more experience collecting vintage Omegas.

Artis

Same watch and I believe that there's radium on the dial. When I checked it with a Geiger counter the reading went up to about 0.7 µSv/h, which seems consistent with radium lume. I also noticed some spotting on the dial that might be radium burn, although I’m not certain.
At this point I’m not planning to restore the dial, but I’m curious what others think. Does this look like typical aging from radium, and more importantly, does the dial appear original to you all? I’d appreciate hearing the opinions of those with more experience with these early Omega dials..

It should definitely be radium from that era. The Geiger reading is probably above background, but quite low for a radium dial, so it's not very hot. I'm not seeing any reason for concern about originality of the dial and personally I would leave it alone.

The sweep hand is not original or even Omega, IMO. Wrong shape, wrong length. That is the glaring issue jumping out at me, but fortunately not too hard to address.

Thank you, Dan. Yes, I thought that the sweeping hand looked weird because its a modern black and too long. Thank you for pointing that out. And I guess that's a pretty easy fix. I guess I would have to look at some old pictures to ses what is the most common sweep hand of that era.. If you know of any, let me know. I would obviously take this to a watchmaker.I'm not comfortable working with radium.

Take a look at some of the watches in this thread, the sweep hands are tapered.


and here is the OVD page: https://www.omegawatches.com/en-us/watch-omega-seamaster-omega-ko-2767