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Looks dirty and is probably in need of a service. I would guess Omega Cal. 620.
These watches are not really that desirable and 200USD would be a bit high for me. Will not be an investment, but if you like it why not.
Without pictures of the movement or the inside of the case, it is impossible to tell if it is genuine. It was common for people to replace the mechanical movement with a much cheaper quartz movement rather than pay for a repair or cleaning.
gatorcpa