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That looks like a late 60's or early 70's Genève Dynamic reference 166.0039. They usually came with an automatic caliber 565 inside, but the word AUTOMATIC would be under OMEGA nearly all the time. This leads me to believe you have a manual wind series 600 under the hood. Later models with automatics (post 1972) used the 101x series calibers - not as good as the 56x series but still decent. If you paid $5 for that you could get a tidy profit - they sell for $200 to $500 depending on condition and whether or not they've been serviced (which your obviously hasn't been recently). Nice find!
Really Good Info!! Excited on the find...Thanks for taking the time to respond! Any recommendations on where I might find a potential buyer for a watch like this??
They have been oddly resurrecting a number of really old threads…