The Omega database is full of holes not only regarding references listed but also the information for any given reference. Lots of missing and incorrect information can be found there. Some things like needing to include an additional digit when looking up a reference simply have no explanation, just one of the mysteries of the database.
The 166.027 would be a good choice for a starter especially if you prefer the looks anyway. I can't imagine these ever going down in value at this point or any other Omega from the same period for that matter.
Buy the best one you can afford. Absolutely don't buy one with a missing bezel, they are virtually impossible to find, long NLA from Omega and other vintage parts sources.
Feel free to post any candidates here on the forum for vetting before making a purchase, whatever one(s) you decide to go after.
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