Two blasts from the past: Omega and Omega Tissot 33.3 Chronographs.
The Omega 33.3 from the very late 30's ( Credit picture: Antiquorum ).
The Omega Tissot, from 1940 ( Credit: Phillips )
Two beautiful chronos, 38 mm big, same movement. Different personality, though.
My favorite? The Omega Tissot, here.