5164 is more of a practical travel watch. Rubber strap and more under the radar makes it better for actual travelling than the more flashy 5990 with its scratch prone bracelet.
So if I had both the 5990 would be for the office (maybe with second time zone set to the time zone of our head office in NYC) and the 5164 would be for business travel and weekends. For beach / ski vacations you would still need a Rolex or Speedie IMHO.
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