Another thing about NATOs which makes them interesting for WIS is that they have a story. Any WIS worth his/her salt can make a listeners eyes glaze over with just 10% of the knowledge he has acquired about a particular watch. But the coup-de-grace comes when he is finished telling about his watch and continues: "And then theres the strap, a NATO/G10. I deliberately emphasize the "G10" because purists.....&c &c"
Put another way, if I see a Speedmaster or Rolex Sub on a bracelet in the wild I figure that there is a less-than-one-percent chance that the wearer is a WIS - if I see one on a NATO then there is at least a 50% chance of the wearer being a WIS.