Is everything legit here (ranchero 2990-1)

I'm more partial to the black dial version. It's academic at this point since it sold, but it looks authentic to me. I would be bothered by the spots on the dial. Those aren't going to improve with age. The case condition is fair IMO. Crown looks correct. I would have liked to see a photo of the outside of the case back. I would have also factored in the cost of a full movement service. Most importantly, I would advise against buying any Ranchero without an extract from the archives and UV and Geiger tests. I've certainly seen better examples, but not for 3,500€..