Women’s watches were smaller and were more likely to be integrated with the watch band. That tended to square off the case. The actual watch face was still based on hands moving in a circle.
Men’s watches when they are integrated with the bands also tend to be squarish.
Do not get me started on the gender coding of children’s clothes and accessories. Judging by pictures of me and my little brother in the 80s, and comparing that to the clothes for sale now, manufacturers spent the past 40 years learning how to avoid making anything that would be purchased for a girl being suitable to be handed down to her little brother.
Men’s watches when they are integrated with the bands also tend to be squarish.