Take it to a watchmaker, have him open it up, take photos of the numbers on the inside of the case back and movement. All necessary information is there.
@jjlopezs - this man speaks the truth. In order to open the caseback you'll need to get a thin blade between the case and caseback, something that could easily put marks on the gold case if you are not competent. Take the watch to a watchmaker as efauser says, he can help you out. post clear photos of the movement + inside of caseback and we can help you out
If you have something to say please say it and explain your reasoning. Vague statements with winking faces don’t help anyone, especially someone asking information about their father’s watch.
The bracelet, while belonging to the watch, is not an original Omega item. It was probably marketed at the shop the watch was bought as a cheaper alternative to the expensive Swiss ones. It's genuine 18k gold and still quite valuable though
