Is this Omega Seamaster authentic?

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I am considering purchasing this watch, so I would like to hear opinions from those of you who are more experienced with Omega's older models.
The sales listing states the following:
Asking price: $800
Year: 1970-1979
Ref. 166.0216.
Box included
The issue is, that I find similar watches on the internet, but none with this colored dial. Is it an aftermarket watch dial or otherwise sketchy?
If it's genuine, what do you think about the asking price, is there room for negotiation?