I would strongly recommend looking at Longines. They made phenomenal watches in that time period, second to none IMO. And since you like sailing, many of their models had nautical themes and/or case-back medallions or engravings, including Admiral, Flagship, and Conquest. There is no justification in omitting Longines (or Zenith for that matter) and including Omega and UG in the category of watch you are considering. As for the arabic numerals, you will just have to look. Most manufacturers made watches with a wide variety of dial designs.
Unless you are prepared to spend a huge of time and effort to become a true expert, I would stay away from vintage UN. They made perfectly good watches, but it will be like a needle in a haystack to find one that is legit.
BTW, C24 is loaded with ridiculously overpriced dealer-prepped drek, with the occasional decent watch. That's not where I look for watches.
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