HELP NEEDED - Looking for any info on these four recent finds

Been a long time since I've posted on the forum as life has kept me busy, but my father showed me these watches that he recently found while cleaning out his parents' house. There were some others but nothing that looked as nice or original as the four below. I took a number of pictures to try to give as much info as possible because that's really all I have to go on, so I apologize for the length of this post. I was unable to get any of the cases opened - two appear to have screw backs but using my little watch ball didn't work and I was afraid to apply to much pressure. Looking to learn as much as possible about each of these watches, and also get some sense of their potential financial value (if any) so your help is greatly appreciated. Feel free to chime in with info on all the watches, or just one or two - all help is great!

The watches are as follows:

1. A men's Waltham - ~31mm case
2. A women's Wittnauer - ~19mm case
3. A unique rectangular women's watch that I THINK says IWC on the case back - ~24mm x ~14mm case
4. A women's Omega on a stretch bracelet (which I assume is not original) - ~19mm case

And here are more detailed images of each:
1. The Waltham which has an engraving to my grandfather on that case back




2. The Wittnauer



3. The (maybe) IWC






4. The Omega

Thanks @gatorcpa - I was able to get the case opened and pull the serial number from the movement. Found the below info:



I'll try to get some good pictures of the inside tomorrow but wondering if this additional info gives any better sense of what I have here, and what its potential value may be?

Thanks again!

Very nice IWC indeed👍