For something like this, you almost need to find an identical watch to steal parts from. What you do is going to depend on how much sentimental value you have.
One "tier" is that nothing is actually missing, or NOS parts are available.
Next "tier" is that the parts can be made easily.
Last "tier" is to send it to Omega where you spend a minimum of $1500 and they make whatever parts you need. This is for watches produced before 1940, and I am confident that yours is that old.
Some here froth whenever they read about factory service but that might be the only way to get that one working.
I have an 1883 pocket watch with so much wrong with it from previous incompetence that there's no point in making it right, so that was a decision that I had to make myself.
Tom