Need help identifying Seamaster

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Hi everyone. I'm very new to this. I've always wanted to own a vintage watch, and finally I picked the Omega to ne my first vintage.
I'd like to ask for help in identifying this omega seamaster. I've been searching for one of these cosmic and I've seen many with dials that has a crosshair line in the middle and also many with date complication but I've never saw one with a clean dial as these.
Edit: the seller mention it's 1980's release. Any input would be very appreciated!

Edited:
 
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And here's another one I found, it's 150$ cheaper than the previous. But doesn't come with the original buckle and crown tho I really like the dial.

 
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Reference 135.017, many different styles of dials were offered.
 
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Reference 135.017, many different styles of dials were offered.
Thank you for that, I'm sealing the deal soon. One more question; is calibre 60x is the original movement for 135.017?
 
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Thank you for that, I'm sealing the deal soon. One more question; is calibre 60x is the original movement for 135.017?

Yes.

The caliber 601 was introduced in 1960 and is one of Omega's best manual wind calibers (IMO).
 
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Thanks for the feedback. I finally got the watch today and I gotta say I really love it. Got it check by local watch service and turns out it still keeping good time. Very happy with my firat vintage! This is also a self present for my 28th birthday.
20181103_131714-jpg.650992
 
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Just because it's keeping time doesn't necessarily mean it doesn't need to be serviced, which it probably does.
 
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Just because it's keeping time doesn't necessarily mean it doesn't need to be serviced, which it probably does.

Good point. I will send it for service later. Cheers