Hm, yes it is a good price! (says $180 here though.)
The listing here:
http://www.ebay.com/itm/Vintage-OMEGA-Cal-601-MEN-17-Jewels-WRISTWATCH-1966-NICE-/361699583636Purchases made through these links may earn this site a commission from the eBay Partner Network
This watch looks closest to these models from the Vintage area of the Omega site:
https://www.omegawatches.com/planet-omega/heritage/vintage-details/15134/ and
https://www.omegawatches.com/planet-omega/heritage/vintage-details/15023/ .
At first, I thought the dial might have been a redial/replacement. That is to say, the watch dial should say 'Geneve' or 'Seamaster 600,' as these two watch lines used the same calibre and case. As your caseback is not signed, it leads me to believe that this is a Geneve. As part of the International Collection, some watches sold overseas didn't have this branding. I suspect that this is the case here. As for the dial, it is either original or a very good redial, as a Seamaster 600 watch I found online does have the same number font and arrangement. I've put your watch and the SM600 picture together for easy comparison.
Crown does look slightly more beefy and is probably a replacement. For this model, the hour and minute hands are appropriate as there is no luminous material (hence why it only says 'Swiss Made' on the bottom and not 'T Swiss Made T' which indicates the use of tritium.) The sweep seconds is more than likely a non-original replacement, while the crystal is also a generic replacement. Case edges are still sharp, which is a bonus.
Overall a decent pickup. Welcome to the forums!
(Edit: The previous watchmaker/owner might have been slightly careless and left a hair inside the watch between the 7 and 8 o'clock markers
)
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