Help Identify My Rolex

[Femr]

I recently purchased a rolex at an estate sale and know nothing about it other than some research I did online. Can you please help me identify it and any other info you might have on it? I'm not looking to sell it but would also be curious what you think it would be worth.... hopefully more than I paid for it! Thanks for any help you can provide.
The little research I did said look at the model near the 12 o'clock position and it says Brevet. The serial number near the 6 o'clock position is five digit 80XXX. According to internet search it says it was manufactured in either 1939 or 1954. It also says Datejust on the dial so was confused if that's the model or Brevet is the model.