Rolex 6263 at a birthday party??

Hello all, I hosted a birthday party for my son over the weekend and ran into a fellow parent who knows I like watches. We got to talking and she showed me a picture of a Rolex 6263 which is in a safety deposit box down the road! My interest spiked but I am certainly not a Rolex expert. She said it was left by her Grandfather and has sat unused in the bank box.

Any expert advice on the originality and value would be appreciated?

Thank you! 😎