For flying I still use the Seiko military I was issued and the Queen forgot to ask for it back - that's for flying. Although the stopwatch minute hand has at some point jumped forward one tick and I have to remember to delete a minute, otherwise it's still incredibly reliable and accurate. I wear it on a velcro strap, and my personal habit is to strap it onto something in the cockpit in front of me in the air. (I still wish they'd put a 1hr stopwatch instead of 30 minutes on the thing 'though).
For formal wear, I have several (sadly the Su27 one I got given by some Russian colleages broke), but my favourite is a one-off. containing a fragment of Dresden Cathedral - presented to me as a speaker at a Test Pilots conference in Bavaria about 1999. (
Wyvern was there too as a speaker, but no idea if he still wears his.)
Depending upon mood, I generally wear one or the other for the office.
G