Welcome!
Don't worry too much about "fishing"— that's for people looking to buy a new old watch, and what to be careful of and watch out for in the churn. Since you're NOT looking to buy (or sell, I hope!) most of the cautions don't apply. The most important part of the watch's history and the greater part of its value, you already know and already have: Its history in your family, and its personal value as an heirloom. It's probably not worth a billion dollars. Or a million.
To find out specifics (when it was produced, the calibration number, movement serial and case model number) you'll need to see inside the caseback, so a jeweler or watchmaker would be best able to tell. Other OF members (other than I) could probably hazard a few reasonable guesses in the meantime. Is it solid gold? Gold plate?
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