My dad left me a watch collection unfortunately he passed when I was 20 years old. I also wondered which model number this is.
That is a beauty of a watch with a lovely curtain dial. All of the information you need is located on inside caseback. Please take your watch to a watchmaker (preferably one who specializes in vintage watches) and have them remove the caseback for you. Then take plenty of pictures of the movement and inside caseback, and post them here. We can tell you more then.
So sorry to hear you lost your dad at such a young age. He must have been quite a young man himself. It’s a beautiful watch and I hope you keep it as a remembrance of your father! It’s a real beauty and the first I’ve ever seen with a dial like that. Your dad must have been very discerning.