Would like to know the value of my fathers omega watch

My father bought this watch sometime in the late 50's while working in the Saudi oil fields. I want to sell this watch. I am trying to find a reputable reliable omega dealer who can tell me the worth of this watch.
Some info on the watch. it is an Omega constellation, a 505 movement, 24 jewel, 5 position and temps, solid gold (18k) Serial # 16,033,200 - 1958 and has a custom hand made solid gold link band on it. (made in Beruit Lebonon)
Can anyone point me to someone who can help ?

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