Expo watch for me is my Citizen Nighthawk A/T
-Solar powered = no dead batteries
-Atomic timekeeping with adjustment in five time zones
-Rated for 660ft Water resistance
Best part to me is the Sapphire glass. I worked maintenance at a Zoo as well as animal care assistant and many other labor intensive jobs such as furniture crafting, general contracting, landscaping, framing... the list goes on. But the watch face looks brand new after 4 years of owning it. I hated buying typical watches for their shock resistance and durability, yet after 5min of owning it, the face would get beat up.
Go from work, to a business meeting or out to a nice restaurant, and the watch is suitable for any setting.
Only thing as a 'negative' is that sometimes I wish it didn't have that nice look to it, though it's hard to tell most watches apart in the eyes of a mugger so any watch being worn in the right place at the right time is subject to theft.
The Filson brand is pretty appealing, though I've also worn my share of Timex and G-shock.