Your photo is unfortunately focused on the background instead of the watch, so we can't judge the condition. But from what I can see, the watch appears to be legit and original, so it's going to be a great heirloom. You can't appraise the value of a watch using asking prices on C24, and I'd say that asking price is probably about 20% over fair market value. However, that's not relevant for you, since you're not planning to sell it.