Omega makes a watch that is pretty plain, with a plain bezel, black face and a more interesting (co-axial) movement than what you find in a Tag. See the pic below for one example. The Rolex Explorer is a good choice; that's my daily wear watch. You can always buy a used one and have Rolex go through it, if you don't want to spend what a new one costs. The Air-King was also made with a black face,a s were a bunch of other models over the years.
JR
