Welcome!
I am curious; if you know nothing about the watch, why do you think the gold bracelet is rare?
As far as value and how to sell, eBay is the best way to find out what it is worth and to get it sold. A 'no reserve' or '$0.99 reserve' tends to get the most activity and highest sale price.
You need a lot more and better photos, including photos of the movement inside, for people to give you meaningful feedback here on OF.
Sorry to hear about your precious uncle.
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