Identification help for vintage man's square gold watch

Please help me identify this vintage Omega watch.
My grandfather sold and repaired watches in my grandparent's jewellery store that started in 1929 (yes!) and closed in 1968. This one has a little chip in the crystal, so I'm wondering if that is why it didn't sell, and he just never got around to replacing the crystal. Now that my parents have passed, this watch came to me.
I see similar pictures of watches around the 1940s, but nothing that is an exact match. The Arabic numerals in black, the single square line for minute markings, but especially the gold bars that cover the band attachments. Perhaps the box will help, which I assume is original.
It is not running, so I'll need help to know what I need to know to have it professionally cleaned and see if that is enough to get it working again.
Will the crystal need to be replaced, if I ever consider selling it?
Any ball-park estimate for the watch with original band and box?
Thanks for any information!

Holy shorts!

Do not concern yourself about a tiny chip in the crystal. These are so darned rare that you won't find a replacement, but rather a crystal fitter would make a new one.

The watch itself looks new. The strap is original and looks new. The box is original and looks new.

You might make a couple of thousand selling it. If you're so desperate that children would go hungry, do it.

The opportunity to honor your ancestors by keeping this in the family cannot be underestimated. While you might not care, others in your family might be devastated if you sell it to some random a-hole.

Clearly you will make your own choice. I pray you will consider what might be right and just, and not look for the money. You are truly blessed to have what many strive for.

By the way, I can recommend a watchmaker in New Mexico USA who will take very good care of this. PM for info.

Very nice watch and condition. It's for the first time i seen that type of box but looks very nice and looks original. (I do not have great knowledge in Omega boxes). If i were you i would keep it. In order to get more info for the model you will have to open it and to check the numbers from inside the watch. Anyway i think here are members that can give you more info only from those pictures..Regards.

Very nice watch! I hope you will keep it in family!

Thank you all for your encouragement to keep this in the family. It is part of the legacy of my grandfather. Thanks also for the advice to bring it to a reputable watch repair shop to get the markings from the inside case. I'm in the Tri-state area of Illinois, Wisconsin, Iowa, so a NM resource is not as convenient.
I have determined that the width is 23mm from outside edge to outside edge. The height is 25 mm.