Vintage Wittnauer men's wrist watch

I know little about this watch and I am trying to learn more about it. All I know is that it's a men's Wittnauer wrist watch with a lovely domed crystal. It has a unique gold band, and I've seen nothing like it on all of the searching I've done. Can anyone tell anything from this picture about it's time frame, value, etc? It's dirty and could use a serious cleaning, but I think it's still pretty cool.