Very likely, adding some highlighting or glowing, or simulating other reflective material on the hour and minute hands will provide adequate contrast.
Notice, most watch manufacturers already provide excellent contrast for the hour and minute hands, as they realize the primary reason for watches are to be able to tell time! (ie. See Watch Wikipedia, http://en.wikipedia.org/wiki/Watch and notice the level of contrast of the hands on the watches within the images. Notice, very little confusion as to where the hands are pointing.)
FYI: I usually fly with the watch within view, along with placing explosives for timing their detonation.