IMO it's a beautiful vintage watch and lovely as is.
Since I can see the brushed finish in the photo I imagine it looks even better in real life. Congratulations on finding an example that *hasn't* had the original finish polished away.
The actual brushed pattern is "soleil" and radiates out from a center point on the dial. To really restore the finish requires specialized equipment for machine turning in two planes available when Omega services it in Bienne, and at a very few watchmakers (UK, maybe US).
So, yes and yes - it can be rebrushed to "factory" at the Factory, and it will be ruined by most "muppets"
As you said, "pretty much mint" - Enjoy!
-ez
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