That is a stunning watch and even setting aside the sentimental value, it is worth several thousand of any currency.
It's probably a 145.012-67/68 or a 145.022-68.
A proper, sympathetic service from a watchmaker accustomed to vintage pieces is imperative. Swapping parts such as the dial, bezel, etc will have a huge affect on value.
I notice you have the bracelet. On the inside on the clasp you should see a date. Perhaps 4 69 (4th quarter of 1969) or similar. This will help with the date the watch was sold (bracelets tended to be added at point of sale).
Let us know where you're located and we'll see if we can recommend someone.
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