Reading about the history of timepieces and the military, and how they different from civilian watches. two things stood out, the shrapnel-protectors used in WW1 watches and an airman's watch that is cantered so is easier to read without excessive arm movement (image used is for wearing on right wrist).
By WWII, the military wristwatch had evolved into something more recognizable today in the form of the "field watch." The most notable of these was the A-11 (though this refers to a mil-spec production standard and not a specific model name). The Army required the watch to be water or dustproof...