Authenticity check: Vintage Omega Genève

Hi everyone, I'm looking for an expert opinion on this Omega Genève I found on "Leboncoin » (French marketplace)

The seller is asking for 500€, but they have only provided these two front-facing photos.

I don't have any pictures of the caseback or the movement yet.
The seller claims it's all original and in working condition, but I'm cautious.
Given the price and the limited photos, does the dial, logo, or hand alignment look correct to you? Are there any obvious red flags that would make you skip this one?

Thanks a lot for your help!

What happend to the lugs?

It's more the rainbow colors I'm refering to...

Didn't know that, thank you very much!