Hamilton first introduced men's wrist watches a little over 100 years ago. Their marketing department must have been comprised of engineers as they named their first models with exotic names like Cushion, Square, Rectangular and other shapes. That lasted for about ten years and you could pretty much name the models on two hands.
One of the models that was advertised but not shown in the catalogs was the Oval. You can see it in the advertisement below along with the "Square Cut Corner".