Help, is this real or a fake?

The enlarged photos aren’t great but they appear to be 'unenhanced' and, consequently, what you see is what you get.

You say nothing about the condition of the watch; service history, running, winding, setting and accuracy, so you may, if you like it and buy it, need to think about a service at some stage, ideally by a local watchmaker which, in the UK, would probably cost about £150 - 200, plus tax and postage.

These 1970s Omegas have excellent movements, plenty of spares available and are, generally, easy to service.

If you look on eBay at the sold/completed listings, you can do price/condition comparisons.

I think the watch looks fine and the price is reasonable although I’d probably offer £400 and pay more depending on how much I want it.