Bonsoir Hubert,
first of all, even in this state it is a great heirloom!
What you need is a good watchmaker who restores vintage watches. He may be able to help you with parts.But the olive pusher may be tricky.
Personally, I would not assess the situation so negative like
@Rman does. There are currently some hand sets in ebay for around 250-300 Euros. And for the dial, you can also give it to a professional redialer. Your watchmaker may possibly suggest one. A redial should cost you around 500 Euros depending on how your dial should look like (multiple colors and scales are more expensive than single and simple prints).
Even with a service, it costs you less than the restoration with Omega.
And the next years you can then save some money and search for an original dial.
Good luck with that!
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