Opinions of this Omgea Seamaster with cal. 520?

Hello eveyone. I'm new in the vintage watch world, and I'm currently searching for an Omega Seamaster around 60s, as I love those ones. I've found one that I like, but I don't know or understand a lot of these watches and I need some help deciding whether components are original and in good conditions. I also has some pictures of the movement, but I don't know if it is in good or bad conditions just staring at it. Could you please help me? Thank you very much!