Nice! That is IMO the best version, black dial, raised angled hour indices, and those fantastic hands!
My own not-exactly-vintage Zenith diver is really growing on me.
Its dimensions are very similar to the Rainbow, so I think I understand what you mean. They are both watches that upon first look seem unimpressive. The more they are worn, the more one appreciates all of the nicely tasteful Zenith touches.
Enjoy!
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