That is a very nice example indeed and looks to be totally untouched with a beautifully clean movement. That sort of condition usually attracts a premium and I think it would fetch a bit more in the UK, up to £600 or possibly even above. For someone who (I presume) doesn't know vintage Omega, you picked a good un! If as I suspect you got it quite cheaply, my suggestion is to keep it and enjoy that glow of satisfaction whenever you remember the bargain you bought, after getting it serviced of course (by an independent vintage specialist - there is absolutely no need to send it to Omega).
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